Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- Jacksonville dist., Mother Lode Belt, Tuolumne Co., California, United States
- Formula
- Ca3Cr2(SiO4)3
- Size
- Thumbnail 2.3x2.1x1.5cm
Tiny deep emerald green crystals of Uvarovite to less than 0.5mm with purple Magnesiochromite. Large examples of these will be on this weeks update.
- Availability
- Sold
- Locality
- Jacksonville dist., Mother Lode Belt, Tuolumne Co., California, United States
- Formula
- Ca3Cr2(SiO4)3
- Size
- SmCabinet 6.5x5.5x4cm
Rich specimen of rare Uvarovite, the green chromium garnet. Uvarovite is very hard-to-obtain and never seen from this Californian localtiy. These are very limited in supply. Crystals are about 0.5mm and well-defined with many lustrous and sparkly faces. The purple is chromium clinochlore, kammererite. This is probably the better specimen of the three posted in this update.
- Availability
- Sold
- Locality
- Outokumpu, Finland
- Formula
- Ca3Cr2(SiO4)3
- Size
- Miniature 4.5x2.5x2cm
Try to find one a Uvarovite from Finland these days. It's not possible. This one came out of our recently acquired collection - the RC Stamberg collection. This collection has no less than 3400 specimens of mostly rare & systematic species.
The crystal on this piece is 5mm.
- Availability
- Sold
- Locality
- Brumado, Bahia, Brazil
- Formula
- CaMg3(Al5Mg)(BO3)3Si6O18(OH)4
- Size
- SmCabinet 9x6x3.5cm
Gorgeous translucent red thick tabular Uvite crystals to 5mm on white to colorless, rhombic crystals of Magnesite to 1.3cm.
- Availability
- Sold
- Locality
- Hamburg, Sussex Co., New Jersey, United States
- Formula
- CaMg3(Al5Mg)(BO3)3Si6O18(OH)4
- Size
- SmCabinet 6x4.5x3cm
- Special Info
- Repaired
A superb, hemimorphic Uvite crystal, terminated to 1.5cm showing nice orange color and exposed well in matrix with Molybdenite. The specimen is repaired as there is a fine fracture through the specimen and under UV light shows a blue FL. The repair is well done however. It is an Carter Rich specimen who originally sold it for $250. His tag notes that it is Ex. English.
- Availability
- Sold
- Locality
- Comstock Lode, Virginia City, Storey Co., Nevada, United States
- Formula
- Ag3AuS2
- Size
- Thumbnail 2.5x2x1.5cm
- Tagged
- sulfide , silver , gold
- Special Info
- Type Locality
- Special Info
- Microprobed
This is an old Steve Pullman specimen microprobed by Alfredo Petrov. It showed not only Uytenbogaardtite, but also microscopic Stephanite and Silver. The Uytenbogaardtite is off to the side as black masses not easily seen in the photos. The masses are more evident on the sides. Parts and grains are obviously rich in Silver or are Silver as evident by it's sectility and fresh silvery surface. It is a mineralogically complicated specimen and is fun to observe under the microscope. Type Locality.
