Rare Mineral Specimens - search page
- Availability
- Sold
- Locality
- Foote mine, Cleveland Co., North Carolina, United States
- Formula
- Mn2+4(BeSiO4)3S
- Size
- 4.5 x 3 x 1 cm - Miniature
Light yellow, glassy, triangular crystals less than 0.5mm in a 3x3mm area.
- Availability
- Sold
- Locality
- Sylvester mine, Zeahan, Tasmania, Australia
- Formula
- PbAl3(SO4)(PO4)(OH)6
- Size
- 4.5 x 4 x 2.5 cm - Miniature
- Tagged
- phosphate
A real cool specimen with green Pyromorphite crystals being replaced by yellow Hinsdalite. Most of smallest, acicular Pyromorphite crystals are totally replaced. Other larger crystals are replaced at the tip. Fun to view under the scope!
- Availability
- Sold
- Locality
- Hogtuva, Rana, Nordland, Norway
- Formula
- Ca4(Fe2+6Fe3+6)O4[Si8Be2Al2O36]
- Size
- 2.8 x 2.3 x 1.1 cm - Thumbnail
- Tagged
- beryllium
- Special Info
- Type & Only Locality
Elongated, thin, bladed black crystals throughout the specimen. The largest crystals reach 9mm. It is extremely rare and found only at this deposit named for the nearest prominent landmark, Høgtuva peak. It is a berllium mineral of the Aenigmatite group.
- Availability
- Sold
- Locality
- Tip Top mine, Custer Co., South Dakota, United States
- Formula
- CaBe2P2O8
- Size
- 5 x 2 x 1.5 cm - Miniature
- Tagged
- phosphate, beryllium, pegmatite mineral
The Hurlbutite is the spheroidal, murky or turbid, colorless crystals seen in the fourth and fifth photos. They actually look like fish eyes. Hurlbutite is a rather rare beryllo-phosphate found exclusively pegmatites. The Tip Top mine, to my knowledge, is the only pegmatite in which Hurlbutite forms crystals, if you call these crystals. The Montgomeryite on this specimen is a light red and forms lath-like crystals to 0.5mm in 1mm groups. Also associated are little white Englishite crystals and very tiny Whitlockite crystals.
- Availability
- Sold
- Locality
- Foote mine, Cleveland Co., North Carolina, United States
- Formula
- Ca4Fe2+Al4(PO4)6(OH)4·12H2O
- Size
- 3.0 x 2.5 x 1.5 cm - Thumbnail
- Tagged
- phosphate, pegmatite mineral
- Special Info
- Type Locality
Radial groups to 0.75mm of white or colorless Kingsmountite crystals.
Kingmountite crystals are much like Montgomeryite both of which form lath-like crystals with a sloping terminations. It is in fact isostructural with Montgomeryite and both are members of the Calcioferrite group. It is also the iron analogue of Montgomeryite and is usually white and sometimes light pink. The best specimens are probably from Hagendorf, although many fine specimens have been collected at Foote. It is primarily a mineral which forms in pegmatites, although has occured in bat caves and hydrothermal altered phosphate rich sedimentary deposits This can be considered a good specimen with both good coverage and crystal groups.
- Availability
- Sold
- Locality
- Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia
- Formula
- Ca4Fe2+Al4(PO4)6(OH)4·12H2O
- Size
- 1.8 x 1 x 1.2 cm - Thumbnail
- Tagged
- phosphate
Tiny, less than 1mm, radial groups of bladed Kingsmountite. The matrix appears to be Microcline.
