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
- Berere Pegmatite Field, Bekapaika Commune, Tsaratanàna, Betsiboka, Madagascar
- Formula
- (Y,Ce,Nd)NbO4
- Size
- Thumbnail 1.8x0.9x0.8cm
Excellent specimen with multiple terminations.
