Red Gill Mine is one of the classic British homes of linarite, and its best specimens occupy a special place in the history of the species. In the tiny oxidized cavities of quartz-sulphide veinstone, the mine produced deep azure-blue PbCu(SO4)(OH)2 crystals that were exceptional for nineteenth-century collectors: thick, sharp, glassy blades reaching sizes that made Red Gill material among the finest linarites then known. The color is the immediate attraction — not a soft powder blue, but a concentrated, almost enamelled blue set against white quartz, iron-stained gossan, dark sulphides, and the paler blue-green of caledonite.
Photo: Albion Fire and Ice
The mine sits in the Caldbeck Fells of northern Cumbria, a compact district whose small lead-copper workings produced a mineralogical literature out of all proportion to their ore output. Red Gill is a secondary-mineral locality above all: the primary ore assemblage was based on galena and chalcopyrite, but prolonged oxidation of lead- and copper-bearing sulphides generated a remarkable suite of lead and copper sulphates, carbonates, phosphates, and related supergene species. Linarite is the signature blue mineral in that assemblage, commonly accompanied by caledonite, leadhillite, cerussite, anglesite, quartz, malachite, and iron oxides.
Red Gill’s collector importance is also historical. Many early specimens were labelled simply “Cumberland” or “Roughton Gill,” a broader and more famous collecting name. Modern reassessment of the Red Gill/Roughton Gill district has argued that many of the old, large, classic “Roughton Gill” linarites most probably came from Red Gill Mine itself. That matters to collectors: a precise Red Gill attribution ties a specimen to the actual source of the finest known nineteenth-century Caldbeck linarite, rather than only to the broader mining field.
Photo: Albion Fire and Ice
For the advanced collector, the best Red Gill linarite is not merely “blue mineral from England.” It is a classic British supergene specimen with a specific look: deep-blue bladed crystals or rich crystalline areas in quartz-sulphide matrix, often with enough associated lead-copper secondary minerals to place it unmistakably in the Caldbeck Fells. Fine crystals are scarce; old labels and convincing provenance add substantially to desirability.
Search for specimens: View all linarite specimens from Red Gill Mine, England
Red Gill Mine lies at Roughton Gill in the Caldbeck Fells, northern Lake District, Cumbria, England. The locality is recorded at National Grid Reference NY295347, with Mindat listing coordinates of approximately 54°42'8" N, 3°5'38" W. It is an abandoned mine within the Roughton Gill group of mines.
The deposit belongs to the Caldbeck Fells lead-copper vein system. The Red Gill veins cut rocks of the Ordovician Eycott Volcanic Group, especially andesites. The mined ore minerals were principally galena and chalcopyrite. The most important collectors’ specimens, however, came from the oxidized upper parts of the vein system, where oxygen-rich groundwater acted on sulphides and produced a richly varied supergene mineral suite. Red Gill’s celebrated linarite formed in cavities within quartz-sulphide veinstone; the best specimens are not loose crusts divorced from their setting, but part of a compact lead-copper oxidation assemblage.
Three veins are known at Red Gill. Most of the workings followed the Main or South Vein, trending roughly north-northwest to south-southeast. Historical geological descriptions recorded the vein as up to about 1.2 m wide in an 8 m shaft near the junction of Red Gill and Swinburn Gill, composed of quartz ribs and broken country rock in a clayey, iron- and manganese-stained matrix. Another level exposed vein material up to about 1.5 m wide. These are small mines by industrial standards, but their oxidized mineralogy was unusually rich.
Mining may have begun very early. Red Gill is said to have been worked in Elizabethan times, and some workings may be older. Documentary evidence exists from the eighteenth century, but the nineteenth-century working period is better recorded. Surviving production figures are incomplete: records note 47 tons of dressed copper ore raised between 1863 and 1869 and a little under 18 tons of lead ore between 1861 and 1866. Those modest tonnages contrast sharply with the mine’s specimen legacy.
The underground workings are not generally accessible today. Mine explorers have entered parts of the workings in the past, but Red Gill is not a collecting locality to approach as an open underground site. The classic material came from old workings and dumps, especially material derived from the Main or South Vein. The dumps have been searched by generations of collectors, and modern accounts describe them as heavily depleted to virtually barren for good linarite, though small representative pieces and micromount-level material have appeared from time to time.
Access is controlled. Red Gill lies within the Caldbeck and Uldale Commons collecting scheme administered by the Lake District National Park Authority and associated landowners. Mineral collecting on these commons requires permission under the current permit system, with collecting zones and conditions set out by the Authority. Serious collectors should treat Red Gill as a protected historic and geological locality, not as an unrestricted dump site.
Notable finds from Red Gill extend beyond linarite. The mine is renowned for caledonite and leadhillite associated with linarite, and its mineral list includes anglesite, cerussite, malachite, pyromorphite, mattheddleite, macphersonite, queitite, native silver, and many other species. Redgillite, Cu6(SO4)(OH)10·H2O, is named for Red Gill because the mineral was first noted there, though the accepted type locality is nearby Silver Gill; Red Gill remains central to the mineral’s history and reputation.
Red Gill linarite is prized for its saturated azure to deep blue color. In the best crystals the blue is rich and glassy rather than chalky, and it contrasts strongly with white quartz, rusty iron oxides, grey sulphide remnants, and the turquoise-blue to blue-green tones of caledonite. The most desirable specimens show discrete bladed or thick tabular crystals in protected cavities rather than only massive blue staining.
Mindat’s occurrence record describes Red Gill linarite as bladed crystals up to 6 mm, along with coatings of small crystals on copper sulphides, some of which are probably post-mining in origin. The broader literature records much larger classic crystals from the mine: Cooper and Stanley described and figured thick deep-blue crystals up to 25 mm long, and later summaries emphasize that Red Gill’s nineteenth-century large linarites were among the finest examples known when collected.
The crystal habit is typical of linarite but unusually attractive in the best Red Gill pieces: elongated blades, tabular crystals, sprays, crystalline crusts, and vug linings. Some specimens show broad dark-blue crystal coverage over quartz or galena-bearing matrix; others are micromount-scale vugs with isolated, high-luster crystals. Aesthetic Red Gill specimens are often miniature to thumbnail in physical size, but the visual impact depends on the intensity of blue and the crispness of the crystals, not on cabinet scale alone.
Common and important associates include caledonite, anglesite, cerussite, leadhillite, bindheimite, quartz, malachite, calcite, and chrysocolla-like copper silicate material. Caledonite is especially important visually and genetically: Red Gill pieces with turquoise-blue caledonite crystals and darker blue linarite are classic Caldbeck associations. Leadhillite and cerussite point to the lead-rich side of the oxidation sequence, while malachite and other copper secondaries reflect alteration of chalcopyrite and related copper minerals.
Matrix is a quality factor. The most convincing Red Gill linarites sit on quartz-sulphide veinstone with iron staining, remnant galena or chalcopyrite, or associated lead-copper secondaries. Massive blue areas on weathered matrix may be attractive, but sharp crystals in cavities are more collectible. Dark sulphide-backed pieces and quartz-lined vugs are particularly desirable because they preserve the geological context of the linarite.
Condition matters greatly. Linarite has perfect cleavage and modest hardness, so bladed crystals are easily bruised, nicked, detached, or dulled by rough handling. Good Red Gill examples should be examined under magnification for broken crystal tips, abraded cavity edges, loose powdery coatings, and evidence that the blue material is merely a smear rather than crystalline linarite. A small, sharp, undamaged crystal group is preferable to a larger but battered coating.
The principal authenticity issue with Red Gill linarite is provenance. Nineteenth-century and early twentieth-century labels may say “Cumberland,” “Roughton Gill,” “Roughten Gill,” or “Caldbeck Fells” rather than Red Gill Mine. Modern locality work has suggested that many early classic linarites labelled broadly from Cumberland or Roughton Gill probably originated at Red Gill. This is good news for collectors when the specimen matches the Red Gill habit and association, but it also means that labels should be interpreted with historical caution rather than literal certainty.
There is also a broader Caldbeck caution involving A.W.G. Kingsbury. A major review of the Kingsbury material demonstrated falsified localities for numerous rare British mineral claims, especially in the Lake District and Caldbeck Fells. Red Gill itself has not been shown conclusively to be the subject of such deception, but uncorroborated rare-species claims associated with Kingsbury should be treated carefully. For linarite, the problem is less “fake linarite” than imprecise or inherited locality attribution.
No specific Red Gill linarite treatment tradition is documented in the sources consulted for this guide. The common risks are natural condition, misidentification of associated blue-green minerals, and post-mining formation of some small sulphate coatings. Linarite can be confused visually with azurite, langite, caledonite, and other blue copper or lead-copper secondaries in poor photographs. On serious specimens, a reputable old label, association with known Red Gill matrix minerals, and analytical confirmation for ambiguous micromounts are all valuable.
Because linarite contains lead, specimens should be handled with normal lead-mineral care: avoid inhaling dust, do not lick or acid-test display pieces, wash hands after handling, and keep fragments away from children and food areas. Cleaning should be conservative. Water, acids, and aggressive mechanical cleaning can damage delicate associated sulphates or loosen fragile crystals in vugs.
Market availability is uneven. Small Red Gill pieces still appear from British dealers and old collections, sometimes as modest small-cabinet specimens with bright blue crystals or massive linarite on iron-stained quartz. Sold dealer examples also show the classic association with caledonite in thumbnail-sized pieces. Stronger historical specimens, especially those with old labels or rich vugs of “electric-blue” crystals, are much scarcer and may trade in a different price bracket altogether. Broader “Caldbeck Fells” or “Roughton Gill” linarites can be attractive, but specialists will pay more attention to whether the specimen plausibly belongs to Red Gill’s classic suite.
The old Red Gill story is a story of small workings and oversized mineral fame. Industrially, the mine was never a giant. Its recorded nineteenth-century output — 47 tons of dressed copper ore in the 1860s and a little under 18 tons of lead ore over a similar period — would barely register beside a major metal mine. Yet the oxidized cavities in its quartz-sulphide veinstone produced linarite crystals that collectors and museum curators remembered long after the ore figures became footnotes.
One of the most evocative field details comes from the No. 2, or “Old Dutch,” Level. A 1979 view recorded the level and its vein as part of a later mineralogical review, a snapshot of Red Gill after its productive life but before the last remnants of the old mineral ground were exhausted by further collecting. The same review illustrates a specimen collected by Peter Briscoe in 1983 from the No. 2 Level dumps: tabular emerald-green brochantite crystals only up to 0.3 mm long sitting beside a large linarite crystal. That is Red Gill in miniature — tiny late copper sulphates, a historical dump, and the deep-blue mineral that made the mine famous.
The labels tell their own story. Some large old linarites were labelled “Roughton Gill” because that name carried weight in the collecting world, but later study has argued that many of the early classic Cumberland and Roughton Gill linarites likely came from Red Gill. In practical collecting terms, this means a nineteenth-century “Roughton Gill” linarite with the right habit, matrix, and association may actually be a Red Gill survivor travelling under an older district name. The specimen label may be wrong in the narrow sense, yet historically truthful about the collecting culture that produced it.
Dealer records preserve a second kind of field note: the afterlife of Red Gill material in cabinets. A classic Caldbeck linarite sold in 2010 was described as a miniature with a 1.8 cm vug lined by gemmy “electric-blue” crystals to 4 mm, carrying an A.E. Foote label dated to about 1884–1890 and thought probably to have been mined in the 1840s–1870s. Even though its label gave the broader Caldbeck Fells rather than Red Gill Mine specifically, it captures the period and style of the old material collectors still chase: a compact, heavy quartz-sulphide matrix, blue crystals in a protected cavity, and the documentary romance of an early American dealer label glued to the bottom.
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