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13.3 x 7 x 5 cm. For the species, this is rather an amazing cluster of crystals, ranging from gemmy almost-scalenohedrons to 2.3 cm all the way up to an incredible 7.4 cm modified prism. The luster on the crystals is excellent, and the color ranges from clear to white. Locality now closed and not producing specimens for collectors.
5.4 x 4.7 x 3.2 cm, 0.7 x 0.4 x 0.4 cm. You just do not think of colemanite as something you could cut into a gemstone, but here you have a FINE 8mm (2.47 carat) stone, obviously cut from a very unusual colemanite specimen with a gemmy area. It is presented here in a set with a VERY aesthetic crystal cluster of colemanite - not a clunky blob, as you usually see, but a cluster of elegant, tabular crystals! This is just a VERY unusual cut and rough set, and a prize for a California or rare cut stone collector. Once on display with other cut and rough sets in the Fallbrook, California museum.
19.9 x 17.9 x 5.6 cm. This is a large plate of superb crystals of California colemanite, from the notable collection of Jim and Dawn Minette. What makes these crystals stand out, in addition to their sheer number on this large plate, is their superb, flashy luster - and, in places, even gemminess - more like a plate of good calcites than colemanites.
6.9 x 5.4 x 5.4 cm. This is a 360 degree knob, complete all around (with the contact on the bottom) of milky, translucent blades of colemanite, an evaporite mineral well-known from this locality. Ex. Minette Collection.
8.1 x 5 x 2.5 cm. Microcrystalline white crystals scattered about colemanite make this a rarity - matrix veatchite is uncommon, and this specimen has a 2-cm-long stream of rich spherical aggregates, in the lower-right corner. Ex. Martin Zinn Collection.
7.2 x 5.0 x 4.2 cm. A large, superb, double pseudomorph borate crystal from the famous Death Valley of California. This sharp, lustrous and sugary crystal is colemanite pseudomorphing meyerhofferite, which itself was pseudomorphing an original large inyoite crystal. It hails from the Corkscrew Mine in Corkscrew Canyon. Very highly representative of these rare borate species and locality. Ex. John Ydren Collection.
19.4 x 16.2 x 15.1 cm. A huge specimen of crystals of colemanite, to 3 cm, piled thickly on a rolling matrix that gives the specimen nice overall aesthetics. The crystals are translucent and have good luster. Ex. Jim Minette Collection.
5.0 x 4.5 x 3.5 cm. A fine, cockscomb-like cluster of gemmy colemanite blades from the Boraxo Mine in Inyo County, California. Ex. Charlie Freed Collection.
8.9 x 5.5 x 5.2 cm. Superb luster distinguished this fine cluster of sharp colemanite crystals from the evaporite deposits at Death Valley. The large crystal measures about 4 cm x 3 cm. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. These crystals are really shiny and sharp.
18.7 x 13.0 x 6.0 cm. A striking, large cabinet colemanite "cross" from the Corkscrew Mine of Death Valley and the Mullane Collection. This unbelievable specimen is a doubly terminated, floater. Glassy, tan to colorless colemanite crystals comprise this piece.
5.4 x 4.0 x 3.1 cm. A classic, old-time and rare pseudomorph and combination specimen from the Corkscrew Mine of Death Valley, California. This superb, two-sided specimen consists of colemanite after sharp, blocky, parallel-growth, inyoite crystals. The fine pseudomorphs, front and back, are completely covered with two colors of brown and tan, sparkly todorokite microcrystals. Todorokite is a very complex manganese hydroxide. This is older material from the 1960s-70s and comes from the Jamie Bird Collection, a California collector from the 1960s-1980s. The blue ink on the accompanying label is characteristic of the 1960s.
12.8 x 9.4 x 6.8 cm. A dramatically formed cabinet pseudomorph of colemanite after a large inyoite crystal from Boron, California. The pseudomorph is shaped like a big, 3-dimensional "checkmark", when viewed at the proper angle and proudly rests on a clayey matrix. The pseudomorph and matrix surface are uniformly covered with lustrous, white, 3-4 mm, colemanite crystals. The major crystal is essentially pristine. Older material, as this piece is from the Margaret Gross Collection of Valley Center, California. This collection consisted mainly of 1950s-1980s material.
8.0 x 6.4 x 6.4 cm. Large, lustrous and translucent, well-formed, light amber colemanite crystals up to 5.3 cm across from an extinct California locality, the Thompson Mine in Death Valley. Some of the faces have showy, very pronounced stepped growth. All of the display faces are pristine. Ex. Mullane Collection.
3.7 x 3 x 2.8 cm. A pair of intergrown Colemenite crystals. These crystals have a sharp, excellent habit with modified edges and translucent to gemmy interiors. Formed in evaporite deposits, Colemanite is a secondary mineral that forms by the alteration of Borax and Ulexite. The largest crystal is 2.3 cm on edge. Ex. Charlie Key Collection.
7.3 x 5.8 x 4.5 cm. Small, sparkly colemanite crystals surrounding a knob of matrix. Ex. Harold Urish Collection.
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share specimen![Colemanite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-117553a.jpg]](db_pics/mdpics/MD-117553a.jpg)
![Colemanite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-119319a.jpg]](db_pics/mdpics/MD-119319a.jpg)
![Colemanite from Baker mine, U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Borate deposit, Boron, K [db_pics/mdpics/MD-177306a.jpg]](db_pics/mdpics/MD-177306a.jpg)
![Colemanite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-178680a.jpg]](db_pics/mdpics/MD-178680a.jpg)
![Veatchite, Colemanite from Billie Mine, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-180068a.jpg]](db_pics/mdpics/MD-180068a.jpg)
![Veatchite, Colemanite from Billie Mine, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-180068b.jpg]](db_pics/mdpics/MD-180068b.jpg)
![Colemanite, Meyerhofferite, Inyoite from Corkscrew Mine, Corkscrew Canyon, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-180775a.jpg]](db_pics/mdpics/MD-180775a.jpg)
![Colemanite, Meyerhofferite, Inyoite from Corkscrew Mine, Corkscrew Canyon, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-180775b.jpg]](db_pics/mdpics/MD-180775b.jpg)
![Colemanite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-187717a.jpg]](db_pics/mdpics/MD-187717a.jpg)
![Colemanite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-187717b.jpg]](db_pics/mdpics/MD-187717b.jpg)
![Colemanite from Boraxo Mine (Kern Borate; Boraxo Deposit; Boraxo No. 1 and No. 2; Clara Claim; Thompson Mine; Tenneco Mine), Inyo Co., California, USA [db_pics/mdpics/MD-192710a.jpg]](db_pics/mdpics/MD-192710a.jpg)
![Colemanite from Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-213180a.jpg]](db_pics/mdpics/MD-213180a.jpg)
![Colemanite from Corkscrew Mine, Corkscrew Canyon, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-217388a.jpg]](db_pics/mdpics/MD-217388a.jpg)
![Colemanite, Inyoite, Todorokite from Corkscrew Mine, Corkscrew Canyon, Black Mts, Furnace Creek District (Furnace Creek Borate District), Death Valley National Park, Death Valley, Inyo Co., California, USA [db_pics/mdpics/MD-217430a.jpg]](db_pics/mdpics/MD-217430a.jpg)
![Colemanite, Inyoite from Boron, Kramer District, Kern Co., California, USA [db_pics/mdpics/MD-224931a.jpg]](db_pics/mdpics/MD-224931a.jpg)
![Colemanite from Boraxo Mine (Kern Borate; Boraxo Deposit; Boraxo No. 1 and No. 2; Clara Claim; Thompson Mine; Tenneco Mine), Inyo Co., California, USA [db_pics/mdpics/MD-227663a.jpg]](db_pics/mdpics/MD-227663a.jpg)
![Colemanite from Boraxo Mine (Kern Borate; Boraxo Deposit; Boraxo No. 1 and No. 2; Clara Claim; Thompson Mine; Tenneco Mine), Inyo Co., California, USA [db_pics/mdpics/MD-229856a.jpg]](db_pics/mdpics/MD-229856a.jpg)
![Colemanite from U.S. Borax open pit (Boron pit), U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Bor [db_pics/mdpics/MD-230144a.jpg]](db_pics/mdpics/MD-230144a.jpg)