Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- Cold Spring Mine, Tungsten Dist., Boulder Co., Colorado, United States
- Formula
- Fe2+WO4
- Size
- SmCabinet 5x8x5cm
- Tagged
- tungstate
A heavy solid 5cm thick vein of lustrous sharp black Ferberite crystals, some of which are well formed in open spaces to 3mm. Impressive specimen!
Additionally, this intersting piece comes with a label from the E. Mitchell Gunnell Collection that mentions it was originally acquired from a minor in Boulder, Colorado in 1938.
- Availability
- Sold
- Locality
- Tae Hwa mine, Chungju, Chungcheongbukdo, South Korea
- Formula
- Fe2+WO4
- Size
- Thumbnail 2x2.5x1.5cm
Cluster of black deeply striated tabular Ferberite crystals with a cluster of thin tabular white Bertrandite to 8mm sticking off one side and minor Ankerite and Pyrite on the backside.
This specimen comes with a label from the Abe Rosenzweig Collection, a well known collector, dealer, and teacher and the Oberlin, Ohio address dates it between 1970 and 1977, so it's more vintage than antique.
- Availability
- Sold
- Locality
- Yaogangxian mine, Chenzhou, Hunan prov., China
- Formula
- Fe2+WO4
- Size
- SmCabinet 6.5x5x4.5cm
Exceptional long tabular crystals of Ferberite to 5.5cm crowned by Quartz and Muscovite crystals. This specimen sits naturally nice and would make a fine specimen for any display case
- Availability
- Sold
- Locality
- Uchucchacua mine, Oyon prov., Lima dept., Peru
- Formula
- Ag8(Sb5As3)S16
- Size
- Thumbnail 1.5x0.6x0.4cm
- Tagged
- sulfide , silver
- Special Info
- EDS Confirmed
Tiny black shiny crystals with good rich coverage. The crystals are very hard to photograph since they are so shiny. From Dr. Hyrsl Jaroslav's stock.
- Availability
- Sold
- Locality
- Berere Pegmatite Field, Bekapaika Commune, Tsaratanàna, Betsiboka, Madagascar
- Formula
- YNbO4
- Size
- Thumbnail 3x2.5x2.5cm
- Tagged
- REE mineral
A fabulous group of Fergusonite. The chemical formula given below is for Fergusonite-(Y) as I have not had this one tested. On the termination is a fractured off spot, which is actually a good thing since you can see the internal nature. It is metamict, so it doesn't yield any crystal structure internally but the external morphology is preserved.
- Availability
- Sold
- Locality
- Mina Ojuela, Mapimi, Durango, Mexico
- Formula
- Cu4ClF(OH)6
- Size
- Chip .7x.5x.3cm
- Tagged
- copper
- Special Info
- XRD Confirmed
- Special Info
- EDS Confirmed
A small chip with bright blue crystals of this recently described new IMA mineral from Ojuela. Once thought to be Claringbullite. This specimen came off of what was probably the type specimen, which was obtained by me several years ago in Denver and shown to be Claringbullite by XRD. Later EDS showed it to be a new mineral. See Ferjerite at RRUFF.
