Graves Mountain lazulite is one of the classic American blue phosphate specimens: deep blue to azure crystals set in hard gray to pale quartzite, commonly with kyanite, rutile, pyrophyllite, pyrite, quartz, and the secondary phosphate suite that makes this Georgia locality so distinctive. It is not the glassy, gemmy style familiar from Yukon lazulites; its appeal is more rugged and architectural. The best pieces show stout, sharp, dipyramidal to tabular crystals, often twinned, sitting in a metamorphic quartz–kyanite rock that immediately identifies the locality.
Photo: Raimond Spekking / Wikimedia Commons
The mineralogical setting is unusually rich. Graves Mountain is a former kyanite mine developed in sericite–kyanite–quartz rock and quartz-sericite schist, with the lazulite concentrated in silica-rich bands rather than in the quartz veins themselves. The old Georgia Geological Survey work described lazulite as locally abundant enough to make up 1–5 percent of the rock where present, and in certain southeast-side zones as much as about 15 percent. That concentration is the reason collectors still find blue lazulite chunks and crystal-bearing quartzite there long after commercial mining ended.
Historically, Graves Mountain became a specimen locality in the nineteenth century. Charles U. Shepard’s 1859 paper drew attention to lazulite, pyrophyllite, rutile, kyanite, quartz, hematite, barite, pyrite, and sulfur from the mountain, and European mineralogists soon studied the crystals. By the time Vernon J. Hurst prepared the 1959 Georgia Geological Survey bulletin, Graves Mountain had already been famous for more than a century as a source of fine rutile and lazulite. The locality then passed through an industrial chapter as a kyanite mine, with collecting opportunities shaped by blasting, quarrying, reclamation, and later organized rockhound access.
Collectors look for saturated blue color, well-defined bipyramidal or tabular crystal form, twinning, intact crystal faces, and attractive contrast against quartzite or pale kyanite–quartz matrix. Loose crystals from weathered seams are prized when complete, but matrix pieces are important because they preserve the locality’s geological context: blue lazulite in the tough, gray, pyrite-speckled quartzite that made Graves Mountain famous.
Search for specimens: View all lazulite specimens from Graves Mountain, Georgia, USA
Graves Mountain lies in Lincoln County, Georgia, near Lincolnton, along the broad Piedmont belt of metamorphosed volcanic and sedimentary rocks. Hurst’s classic 1959 study described the mountain as an asymmetric monadnock about a mile long northeast–southwest, rising roughly 400 feet above the surrounding countryside. Before mining reshaped it, the mountain had two summits separated by a saddle; quarrying later produced the large pits and broken highwalls familiar to modern collectors.
The key rocks for lazulite collectors are the sericite–kyanite–quartz rock and associated quartz-sericite schist. In simple collecting terms, the blue lazulite is hosted in hard quartzite-like rock rather than in clean open-pocket quartz veins. Hurst described three principal rock types at Graves Mountain: quartz-sericite schist, sericite–kyanite–quartz rock, and quartz conglomerate. The sericite–kyanite–quartz rock and quartz conglomerate trend northeast–southwest along the mountain’s axis, flanked by quartz-sericite schist. The highest-grade collector minerals—kyanite, pyrophyllite, rutile, and lazulite—are concentrated in a narrower northeast-trending fractured and recrystallized zone.
The deposit is best understood as a highly unusual metamorphic and hydrothermal concentration of aluminum silicates, phosphates, titanium oxide, sulfides, and sulfates. Kyanite was the economic mineral; rutile and lazulite were the collector prizes. Hurst interpreted the lazulite, rutile, barite, and andalusite as forming after the kyanite, in a fractured zone where phosphorus, titanium, sulfur, and barium had been introduced or concentrated beyond what the original rock composition alone would suggest.
Mining history came in several waves. The locality was known to collectors after Shepard’s 1859 publication, and fine rutile and lazulite specimens circulated into museums and private collections. In the twentieth century, Tiffany & Co. interests are associated with rutile specimen and industrial activity at the site, followed by kyanite development. A 1940 adit was driven into the southeast slope to obtain unweathered kyanite-quartz rock for flotation testing; a 300-pound sample was sent to American Cyanamid’s Stamford ore-testing laboratory, where tests showed a high-grade kyanite concentrate could be produced. Commercial kyanite mining followed in the 1960s, with Aluminum Silicates, Inc. and later Combustion Chemicals, a subsidiary of Combustion Engineering, operating the property. Combustion Chemicals mined until 1984, Pasco Mining operated briefly afterward, and mining ceased after 1986.
Collecting access is controlled and should never be treated as casual public access. The Georgia Mineral Society describes Graves Mountain as accessible by arrangement for colleges, universities, gem and mineral societies, and small groups of individual collectors, with the caretaker’s permission. Seasonal Rock Swap & Dig events have traditionally opened the mountain to collectors, usually in spring and fall, with sign-in, liability release, hand-tool rules, parking restrictions, and strict safety boundaries. Highwalls are unstable, standing water may be acidic, and the old quarry environment demands hard hats, eye protection, sturdy footwear, and conservative judgment.
Notable finds include loose and matrix lazulite crystals, blue quartz, iridescent hematite and goethite, pyrophyllite sprays, large rutile crystals, quartz crystals with hematite coatings, and a suite of microscopic secondary phosphates and phosphosulfates. For lazulite specifically, the best finds have come both from quartzite boulders and from weathered clay seams where the quartzite has broken down enough to release blue crystals without destroying them.
Graves Mountain lazulite is MgAl2(PO4)2(OH)2, occurring in the locality’s sericite–kyanite–quartz rock rather than as a typical open-vein pocket mineral. Hurst described the crystals as pyramidal to tabular, commonly twinned, and mostly less than about half an inch across, with the largest in his study around 1.5 inches. Later collector accounts report loose bipyramidal crystals from weathered areas reaching as much as 4 inches, though such crystals are exceptional and should be treated as major locality pieces.
Color ranges from dusky blue in fresh crystals to azure blue, grayish blue, and mottled blue-and-white in weathered crystals. The most attractive specimens show a saturated indigo-to-royal-blue body color with enough surface integrity to show crystal form. Weathering can brighten the apparent blue, but it can also soften edges, bleach interiors, and introduce white mottling or alteration along fractures.
The locality’s most characteristic forms are stout dipyramidal crystals, tabular crystals, and twinned crystals embedded in quartzite. The best crystals have sharply defined faces rather than merely blue granular masses. Some specimens show what collectors call “butterfly” or joined-pyramid twinning, a habit that gives Graves Mountain lazulite much of its personality.
Matrix matters. Classic Graves Mountain lazulite is set in gray to whitish kyanite–quartzite, sometimes with sprinkles of pyrite, pale kyanite blades, quartz, rutile inclusions, or coatings and books of sericite or pyrophyllite. Hurst noted that many crystals contain visible inclusions, most commonly colorless quartz grains or minute red-brown rutile crystals, with less common inclusions of sericite, pyrophyllite, and andalusite. Mica or pyrophyllite may lie against individual crystal faces, sometimes giving specimens a slightly plated or “packed” look rather than a clean open-pocket appearance.
Two broad specimen styles are important. One is the hard gray kyanite–quartzite containing lazulite crystals; these pieces can be durable and handsome, and many lapidary slabs and cabochon materials come from this style. The other is the whiter, more friable kyanite–quartzite described in collector literature as yielding the best crystals, though that material is no longer exposed in the mine area in the way it once was. Weathered iron-stained material recovered in the late 1960s contained altered lazulite crystals and casts after lazulite, a reminder that the locality’s secondary phosphate story is closely tied to the breakdown of the primary phosphate-bearing rock.
Associated minerals include kyanite, rutile, pyrophyllite, quartz, pyrite, muscovite/sericite, paragonite, hematite/goethite, barite, variscite, woodhouseite, crandallite, strengite, phosphosiderite, cacoxenite, dickite, jarosite, sulfur, and related micros. For hand specimens, kyanite, rutile, quartz, pyrophyllite, and pyrite are the associations most likely to matter aesthetically and diagnostically. For micromounters, cavities and angular casts in the kyanite–lazulite–quartzite can host the secondary phosphate and phosphosulfate suite, including pseudomorphs after lazulite.
Quality is judged by completeness of crystal form, depth and evenness of blue color, contrast with matrix, degree of weathering, and freedom from bruising. A small, sharp, well-colored twinned crystal in matrix is often more desirable than a larger dull patch of blue in quartzite. Conversely, large cabinet slabs with abundant blue lazulite can be appealing when the color is rich and the distribution is graphic, especially when cut or polished material is acceptable to the collector.
The first authenticity issue is locality style. Graves Mountain lazulite should look geologically at home: blue crystals or masses in quartzite-like sericite–kyanite–quartz rock, commonly with kyanite, quartz, pyrophyllite, pyrite, or rutile. A bright blue, glassy, isolated crystal on an unrelated matrix should be questioned. Yukon lazulite, Austrian lazulite, Brazilian material, and lapidary “blue stone” can all look different; labels matter, and old labels from Georgia collections add real value when credible.
Documented, locality-specific fake lazulite from Graves Mountain is not a major published problem, but misidentification is common in the broader blue-mineral market. Lazulite may be confused with lazurite/lapis lazuli in casual listings, and massive blue material can be miscalled “azurite,” “blue quartz,” or simply “kyanite” by non-specialists. In Graves Mountain specimens, the presence of hard quartzite, kyanite, and the known rutile/pyrophyllite association is often more convincing than color alone.
Condition is the central collecting issue. The host rock is tough, and extracting complete crystals from fresh quartzite is difficult. Haege’s field account bluntly notes that whole crystals are nearly impossible to remove from fresh rock, which is why loose crystals from weathered seams are so appealing. Those loose crystals, however, may be rounded, altered, cracked, or partially replaced. Hurst described weathered lazulite altering along margins and fractures to a fine-grained material, partly gibbsite; that alteration can make a crystal look chalky, mottled, or weak.
Matrix specimens often show bruised crystal edges, iron staining from decomposed pyrite, saw marks if prepared as lapidary material, or broken quartzite surfaces from sledge work. Pyrite in the matrix may oxidize, leaving brown staining or cubic voids. Pieces with pyrite should be stored dry and monitored, especially if they came from highly weathered or acidic areas of the mine.
Rarity is tiered. Small blue lazulite-bearing quartzite pieces are still obtainable, especially from field-collected material and modest dealer stock. Good distinct crystals are scarcer. Sharp twinned crystals, large complete bipyramids, and old labeled specimens from historic collections are much harder to replace. Museum-grade Graves Mountain lazulite is genuinely rare, because many crystals were either locked in unyielding quartzite, destroyed during mining, or collected generations ago.
Current market availability is sporadic but not extinct. Modest Graves Mountain lazulite-in-quartzite specimens appear from small dealers, old collections, and field collectors; prices for simple pieces can remain accessible. Well-formed crystals, early labeled examples, and large display pieces are far less common and should be evaluated against known locality habits rather than against more transparent lazulite from other localities.
The Graves Mountain story begins with the kind of nineteenth-century mineral notice that changes a locality’s fate. Shepard’s 1859 article did not merely list another Georgia occurrence; it put lazulite, pyrophyllite, rutile, kyanite, quartz, barite, pyrite, hematite, and sulfur into the hands and imagination of mineralogists. Hurst later wrote that after Shepard’s paper, Graves Mountain specimens were eagerly sought by German mineralogists, leading to crystallographic studies between 1860 and 1897. That is the first great image of Graves Mountain: blue lazulite and metallic rutile leaving a Georgia hill and entering the cabinets and measuring instruments of Europe.
By 1935, lazulite collecting at Graves Mountain was already part of the documentary record. A Georgia Archives photograph dated June 29, 1935, shows H. C. Ull collecting lazulite from quartzite on the slopes of the mountain. The caption is spare, but for a collector it says everything: not mine-run ore, not a polished souvenir, but a person working the quartzite itself, looking for blue phosphate crystals in the hard rock that had made the mountain famous.
Later accounts preserve the more tactile reality of collecting. The lazulite below the dam in the main pit was not described as something one casually plucked from a pocket. The quartzite was so tough that whole crystals were nearly impossible to remove from fresh rock. The prize was the weathered seam: clay left where the rock had broken down, with loose blue crystals freed by time rather than by a hammer. Haege reported that bipyramidal lazulites to 4 inches had been found in those weathered areas, while also noting that he had not seen facet-grade lazulite from the mountain despite rumors.
The industrial chapter adds a sharper edge to the story. Combustion Engineering’s mining stripped the mountain with shovels, trucks, crushers, and ball mills. The target was kyanite for ceramic refractories, but the gangue included the very minerals collectors loved: rutile, lazulite, pyrophyllite, quartz, and pyrite. Many fine specimens were recovered in the early mining years, and many more were ground away. Haege’s account of rutile recovery during restricted collecting years is memorable: equipment operators, seeing a few shiny faces in a blasted rock, would leave their machines under the excuse of a private errand and hide the rock in a lunchbox. Although the story is about rutile, it captures the collecting culture around Graves Mountain perfectly—world-class crystals passing within inches of the crusher, saved by quick eyes and quicker hands.
The modern Rock Swap & Dig culture is another chapter. The organized open-house events began in 1998 under Clarence Norman Jr., known to collectors as Junior. At first, vendors set up not on the mountain but down the road at Junior’s garage and junkyard; diggers collected on the mountain and then returned to see what was for sale or trade. Around 2000, vendors were allowed to set up on the mountain itself, and the event grew into a biannual gathering. During the restricted 2020 and 2021 digs, attendance dropped from hundreds of people per day to only 50 per day, and Junior and Melissa extended the usual three-day event to ten days so more collectors could attend.
One field-trip historian summed up the rhythm of the digs with a line that belongs to Graves Mountain alone: thousands of pounds of lazulite, blue quartz, and pockets of iridescent hematite had been found over the years, along with rutile crystals turning up at nearly every dig “like clockwork.” That does not mean every collector walks away with a cabinet specimen. It means the mountain remains alive as a collecting locality: blue chips in the dirt, quartzite boulders that may or may not split kindly, hematite pockets that flash only when the angle is right, and the persistent possibility that a weathered seam still holds a complete blue crystal.
Amethyst
Quartz
Fluorite
Tourmaline
Malachite
Azurite
Rhodochrosite