A collector's guide to Otjikotu, Kaokoveld, null: its geology, mining history and notable minerals, illustrated with the 21 specimens documented from this locality on EarthWonders.
Key facts
Otjikotu is one of the collector names attached to the Kandesei–Okandawasi copper occurrence of northwestern Namibia’s Kaokoveld, a remote, arid belt of small copper-lead showings between Opuwo and Sesfontein in the Kunene Region. In specimen literature the same material may appear as Otjikotu, Kandesei, Okandawasi, Otjozongombe, Old German mine, or simply “Kaokoveld mine,” a confusing history of local names, dealer labels, and operator names that matters greatly when building a serious collection. The mineralogical identity, however, is unmistakable: deep emerald-blue-green dioptase, velvety blue shattuckite, robin’s-egg chrysocolla, and sharp green malachite developed in oxidized copper-silicate pockets in folded carbonate rocks of the Damara Belt.
The deposit is not a large industrial copper mine in the Tsumeb sense. Its importance is specimenological. The best pieces have the saturated colour and high contrast collectors want: lustrous dioptase crystals standing on blue shattuckite or pale chrysocolla, malachite spheres or rare sharp crystals set into quartz-lined vugs, and rolling interiors of blue copper silicate that look more like a lined geode than a typical vein specimen. The finest Otjikotu/Kandesei specimens sit in the small-cabinet to miniature range, but their visual intensity can rival far larger pieces from more famous localities.
Regional View
Country View
Geologically, the mineralization belongs to sediment-hosted copper occurrences in the Kaokoveld portion of the Damara Orogen. The host succession includes carbonate-dominated Otavi Group rocks overlying older clastic Nosib Group sediments, with copper mineralization concentrated in folded, brecciated, and veined limestone and dolomite units. Primary chalcocite, bornite, galena, pyrite, barite, quartz, calcite, and chlorite were later overprinted by intense oxidation. In this dry terrain the supergene zone produced an unusually rich copper-silicate assemblage rather than a simple cuprite-native copper suite, which is why Otjikotu is so distinctive to collectors.
Photo: Wikimedia Commons / Rob Lavinsky
The locality’s best specimens are visually different from Tsumeb dioptase. Tsumeb is the grand polymetallic classic; Otjikotu is the vivid copper-silicate pocket locality. Here, the dioptase commonly has a slight bluish cast and is often thinner and more elongated. The shattuckite can form velvety radial aggregates, blue linings, and pseudomorphs, while chrysocolla provides the pale, botryoidal contrast that makes many specimens immediately recognizable.
Photo: Wikimedia Commons / Rob Lavinsky
Search for specimens: View all specimens from Otjikotu, Kaokoveld, null
Otjikotu, as used on many specimen labels, is best understood as a collector-market name for Kandesei/Okandawasi material from the Kaokoveld copper district of the Kunene Region, Namibia. Mindat places Kandesei at about 18°49'19"S, 13°57'48"E, roughly 10 km southwest of Omaue, and records the historical names Kandesi, “Kaokoveld mine,” and “Otjikotu,” with Okandawasi as the local Herero name. This is the locality most collectors mean when they speak of the vivid Otjikotu dioptase-shattuckite suite.
The district lies in the northwestern arm of the Damara Orogen. The mineral occurrences are hosted mainly by Neoproterozoic carbonate and mixed sedimentary rocks: limestones, dolomites, slates, shales, and subordinate quartzites assigned to the Otavi Group above Nosib Group clastics. The Ombombo Subgroup, including the Lower Omao sequence, is particularly important, and the Abenab carbonates also host copper-rich breccias and mineralized zones. Folding is central to the geology at Okandawasi: chalcocite- and copper-silicate-rich pods occur in the apices of folds within the Obombo and Abenab units, with additional stockwork and fault-controlled quartz-carbonate veining.
The ore is small-scale but mineralogically rich. Primary mineralization includes chalcocite, bornite, galena, pyrite, barite, calcite, chlorite, quartz, and local sphalerite and tetrahedrite. In the oxidized zone, which drilling in the broader district has shown can extend to depths of 50 meters or more, copper was remobilized into a suite dominated by dioptase, shattuckite, plancheite, chrysocolla, malachite, cuprite, quartz, calcite, barite, cerussite, wulfenite, and several bismuth- and silver-bearing rarities. Much material once field-called “chalcocite” in massive sulfide-rich veins, particularly around Okandawasi, has also been shown by thin-section work to include djurleite.
Historically, the Kaokoveld copper occurrences have been explored for decades without yielding a large modern copper deposit. Exploration in the region involved a succession of companies and prospectors, while the specimen trade developed around shallow pits, trenches, and hand-worked pockets. The 2013 Mineralogical Record account describes Kaokoland Mining and Exploration as the organized mechanical operator active at Okomunwe at that time, with some production from other operations such as Okandawasi processed at Otuani, while most specimen mining was undertaken by local Herero miners. The nearby Christoff mine, also associated with Kaokoland Mining and Exploration, produced an important dioptase find in 2007.
Okandawasi is the largest specimen excavation in the immediate area and the key pocket locality behind many Otjikotu-labeled specimens. It is situated on Okomunwe Hill and is reported to have produced more than 20 minerals. It yielded some of the best dioptase and shattuckite of the district, with additional pockets found as workings were expanded along strike and eastward during the period documented in the major published studies. Christoff, Van der Plas, Otjozongombe/Kandesi, Okapanda/Otjhowe, Okarvizo, Omaue, Otuani, Onderra, and Okatumba form the surrounding constellation of names that complicates old labels, but also helps explain why “Kaokoveld” specimens can vary so much in habit and association.
Collecting access should be treated as restricted and permission-based. These are not public recreational diggings: they are remote mineral workings on mining or communal lands, with active or intermittent prospecting, specimen digging, and ore handling. Serious collectors should acquire specimens through established dealers or through permitted, locally authorized arrangements, and should expect Namibian export and land-access rules to apply. Seasonal conditions also matter; published field accounts note that wet-season rains can make dry river-bed routes impassable, and specimen mining in the district typically stopped by early December and resumed around mid-April.
Dioptase is the flagship mineral of Otjikotu/Kandesei: blue-tinted emerald-green, lustrous, and commonly more elongated than classic Tsumeb crystals. Published work on the district distinguishes an early generation of small dioptase, generally below 1 cm and often under 5 mm, from a later generation on chrysocolla that produced the showier crystals; from the broader Kaokoveld workings, individual crystals are reported to 9 cm, though most collectible Otjikotu material is miniature to small-cabinet scale. At Kandesei, highly lustrous crystals to about 2.5 cm have been described on bright yellow, glassy calcite rhombohedrons, while Okandawasi and nearby Christoff are known for dioptase with shattuckite, plancheite, malachite, chrysocolla, quartz, and occasional mottramite or beyerite coatings. The best Otjikotu pieces are three-dimensional rather than flat plates, with clean, undamaged lustrous crystals rising from blue copper silicate or pale chrysocolla; ordinary pieces tend to be crusty, partly quartz-coated, abraded, or visually crowded by matrix.
Malachite is common throughout the Kaokoveld workings, including Kandesei and Okandawasi, but truly fine Otjikotu malachite is more selective than its abundance suggests. The usual habit is fibrous bundles, sheaves, and spherical radial aggregates, sometimes reaching about 3 cm across and commonly associated with shattuckite, chrysocolla, quartz, and dioptase. At Kandesei, Okapanda, and Okandawasi, these green spheres may carry a thin transparent quartz coating, giving them a polished or iced appearance in vugs. Primary malachite crystals are rare from the district, with reported Kandesei examples associated with quartz, calcite, and dioptase; malachite pseudomorphs after azurite and cuprite are also documented from Okandawasi. The best Otjikotu malachite specimens have crisp, saturated green form—either sharp crystals, fresh radial balls, or malachite set dramatically into shattuckite-lined pockets—while lesser examples are massive, bruised, fuzzy, or overwhelmed by earthy oxide.
Shattuckite is the mineral that made the Otjikotu/Kandesei name internationally important, and the Kaokoveld district has been described in print as having produced the world’s finest examples. At Kandesei and Omaue it may be pale turquoise-blue, while Okandawasi is noted for richer dark-blue material; in radial spheres the colour can grade from dark center to pale rim or the reverse. The typical habit is concentric radial growth on plancheite, often velvety, though it also occurs as massive breccia cement, vein filling, botryoidal coatings, and quartz-coated aggregates. Important associations are quartz, chrysocolla, plancheite, malachite, and dioptase, and Okandawasi has yielded shattuckite pseudomorphs after quartz and earlier dioptase. The most desirable Otjikotu shattuckite pieces show plush, undamaged blue radial texture, clean vug architecture, or rare pseudomorph form, ideally with green dioptase or malachite contrast; common pieces are massive blue fracture-fillings or quartz-coated material with less visible velvet.
Chrysocolla is the pale-to-bright blue matrix and pocket-lining mineral that gives many Otjikotu specimens their instantly recognizable contrast. It is common across the district and has been mined both as lapidary rough and, when copper prices justified it, as hand-sorted copper ore, but specimen-quality chrysocolla is much less common than massive rough. At Otjikotu/Kandesei it occurs as massive, botryoidal, and locally geode-like material, commonly covering or replacing other copper silicates except for later dioptase. Okarvizo is noted in the broader district for chrysocolla-rich breccia with small, sometimes doubly terminated dioptase crystals, while Otjikotu-labeled collector specimens often show dioptase perched on pale chrysocolla or shattuckite and dioptase inside chrysocolla-lined cavities. The best examples have clean botryoidal “grape-like” chrysocolla that is aesthetically strong on its own, not merely a matrix, and that frames lustrous dioptase or velvety shattuckite without smothering it.
Other minerals documented from Kandesei/Okandawasi and the Otjikotu-labeled suite include quartz, calcite, dolomite, barite, cerussite, wulfenite, plancheite, azurite, cuprite, chalcocite, djurleite, chlorargyrite, iodargyrite, native copper, native silver, hemimorphite, goethite, hematite, beyerite, mottramite, namibite, and apachite. No well-established valid mineral species has Otjikotu/Kandesei as its type locality, but the rarity suite is strong: apachite has been identified as fine blue needles on chrysocolla from Okandawasi material, namibite and beyerite occur in the bismuth-rich oxidized assemblage, iodargyrite is listed from Kandesei, and a single native-silver specimen from Okandawasi is reported as tiny wires on goethite, chrysocolla, and calcite. For advanced collectors, these rare phases are almost always micromount or analytical-specimen interests rather than cabinet-display species.
The first authenticity issue with Otjikotu is the label, not the mineral. “Otjikotu,” “Kandesei,” “Okandawasi,” “Kaokoveld mine,” “Old German mine,” and “Kaokoveld Plateau” have all been used in the specimen trade, sometimes imprecisely. The safest practice is to preserve the original label exactly, then add a modern note such as “Kandesei/Okandawasi area, Opuwo Rural, Kunene Region, Namibia” only when the specimen style, provenance, or dealer history supports it. Avoid over-specific relabeling unless the chain of custody is strong.
The most common market confusion is between true Kandesei/Okandawasi material and broader Kaokoveld material from Omaue, Christoff, Otuani, Onderra, Van der Plas, Okatumba, Okarvizo, or related pits. Many are geologically related and visually similar, but serious locality collectors will value precise labels. Specimens sold simply as “Kaokoveld” may be perfectly legitimate, but they should not automatically be upgraded to Otjikotu or Kandesei without evidence.
Condition is critical. Dioptase from this locality can have superb lustre, but exposed crystal edges chip easily, and larger clusters may be less three-dimensional than photographs suggest. Quartz coatings are natural and locally characteristic—especially the “sugar-coated” look on early dioptase or shattuckite—but they can either enhance or obscure the specimen. Chrysocolla and shattuckite can be friable or porous, malachite sprays can be tender, and pocket specimens may hide repaired contacts or stabilized matrix. Examine vug rims, high points, and the backs of specimens for glue, colour mismatch, fresh breaks, or crushed blue silicate.
No widely documented, locality-specific fake industry is attached to Otjikotu in the mineralogical literature, but the assemblage is now popular enough that misidentification and vague locality inflation are real concerns. Tumbled “Quantum Quattro” material and polished copper-silicate mixtures should not be confused with crystallized Otjikotu specimens. Likewise, bright green copper minerals on pale blue matrix may be advertised as dioptase, malachite, chrysocolla, shattuckite, or plancheite without analysis; on fine pieces, morphology and provenance matter.
Rarity varies sharply by quality. Massive chrysocolla and shattuckite-rich matrix are available more often than sharp dioptase clusters, primary malachite crystals, intact shattuckite-lined pockets, or pieces with balanced dioptase-shattuckite-chrysocolla aesthetics. Fine miniatures and small cabinets with undamaged dioptase on blue copper silicate remain the core market. Rarities such as namibite, beyerite, iodargyrite, apachite, and native silver should be treated as analytical or provenance pieces unless accompanied by reliable identification.
The most memorable story attached to Otjikotu is the name itself. In the Kaokoveld, a specimen’s label can read like a trail map crossed with a rumor. The pit known locally as Okandawasi has appeared as Kandesi, the Old German mine, the Kaokoveld mine, and, in the American market, Otjikotu. Published authors noted that names were multiplied by old exploration reports, current operators, local usage, and crystal sellers who sometimes obscured localities to protect productive pockets. For collectors, that confusion became part of the locality’s identity: the same blue-and-green pocket style could arrive at shows under several labels, all pointing back to a small cluster of workings on and around Okomunwe Hill.
The field setting has its own rhythm. The main mining areas lie about 10 km off the Opuwo–Sesfontein road, with access often following dry river beds. In dry weather the tracks are part of the adventure; in the wet season they can become impassable, and the published field accounts note that specimen mining generally stopped by early December and resumed around mid-April. That seasonal pulse helps explain why Otjikotu material has often reached the market in batches rather than a steady stream: pockets are found, extracted, sorted, and then the desert weather closes the curtain.
In 2007, the nearby Christoff mine produced what the Mineralogical Record called an exceptional haul of dioptase crystals. That find matters to Otjikotu collectors because Christoff and Okandawasi have both been entangled with the “Old German mine” name, and because their dioptase belongs to the same high-grade Kaokoveld copper-silicate story. The Christoff pieces helped confirm that the district was not merely a shattuckite curiosity but a serious modern source of world-class dioptase, with lustrous crystals, strong colour, and associations very different from Tsumeb.
Dealer descriptions from the first wave of high-end Otjikotu specimens capture the excitement well. One Rob Lavinsky specimen, a 4.5 x 4.0 x 2.5 cm chrysocolla geode lined with shattuckite and dioptase, was described as one of only a few such combinations to emerge from “small batches” trickling out of the locality. The appeal was not only rarity but architecture: a large intact vug with rolling blue interior, valuable enough that it might have brought more money if split into two specimens, yet more important as a complete pocket.
Another Lavinsky description of a 5.9 x 4.2 x 2.4 cm dioptase from Otjikotu makes a collector’s point that still rings true: the material could show lustre and colour comparable to Tsumeb, but the market gave a premium to the older, more famous mine. He argued that some Kaokoveld specimens were undervalued relative to their quality. Whether or not one accepts the price comparison, the observation is useful: Otjikotu’s best dioptase is not just a “Namibian alternative.” It has its own signature, especially where green dioptase meets blue chrysocolla, an association not typical of Tsumeb display pieces.
The malachite story is smaller but irresistible. One photographed Otjikotu miniature shows an 8 mm primary malachite crystal, sharp, gemmy, and electric green. That is not the common Kaokoveld malachite mode of fibrous spheres and radial bundles. For a locality famous for copper silicates, a genuinely sharp malachite crystal is a connoisseur’s object: tiny, easy to overlook beside dioptase, but remarkable to anyone who knows how rarely malachite behaves so crisply.
