Rare Mineral Specimens - search page
- Availability
- Sold
- Locality
- Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia
- Formula
- (Al,Ta)7(Si,Sb)3(BO3)O12(O,OH)2.25
- Size
- 3 x 2.5 x 1 cm - Thumbnail
- Tagged
- pegmatite mineral
- Special Info
- Fluorescent
Greyish plates of fairly rare mineral with Elbaite. Holtite is a pegmatite mineral found in five localities worldwide. It comes with a Russian label.
- Availability
- Available
- Price
- $95.00
- Featured
- Featured in Special Editions
- Locality
- Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy
- Formula
- Mg5(CO3)4(OH)2·4H2O
- Size
- 5.5 x 2 x 2 cm - Sm Cabinet
- Tagged
- carbonate
- Special Info
- Antique Specimen
This is the variety of Hydromagnesite, idogiobertite, a hydrous carbonate of magnesia. The vial is an antique specimen labeled 1906 and filled with the powder of this mineral. An early reference to this variety can be found in J. Logan Lobley's "Mount Vesuvius". Here Lobley describes the mineral as rare and found enclosed in a large fragment of ancient lava...."Eugenio Scacchi gives it the name Idrogiobertite" (from Vesuvius). Dana (6th Ed) states this variety was named by Scacchi on Dec. 12, 1885. Very few specimes out there would have this varietal name placed upon the specimen. Rather most will call it the proper defined name as "Hydrmagnesite".
- Availability
- Sold
- Locality
- N'Chwaning III mine, Kalahari Mn fields, Northern Cape Province, South Africa
- Formula
- Ca3Mn4+(SO4)(CO3)(OH)6·12H2O
- Size
- 5.5 x 1.5 x 3 cm - Sm Cabinet
Lemon yellow seam of Jouravskite. Rich specimen. Excellent specimen for this rare carbonate.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Vulcano Island, Sicily, Italy
- Formula
- Na3SO4F
- Size
- 6 x 4.5 x 3.5 cm - Sm Cabinet
Light weight mass of chalky white, rare, Kogarkoite with slightly green Chalcanthite.
- Availability
- Available
- Price
- $30.00
- Locality
- Jenipapo dist., Itinga, Minas Gerais, Brazil
- Formula
- KZr2(PO4)3
- Size
- 3 x 3 x 3 cm - Thumbnail
- Tagged
- phosphate, pegmatite mineral
Colorless, or slightly bluish, modified cubic crystal to 1mm on cleavelandite matrix.
- Availability
- Available
- Price
- $75.00
- Locality
- Iron mine, Kovdor Massif, Kola Peninsula, Russia
- Formula
- Mg2PO4(OH)·3H2O
- Size
- 2.5 x 3 x 2 cm - Thumbnail
- Tagged
- phosphate, pegmatite mineral
- Special Info
- Type & Only Locality
Blue, glassy crystal grains from 5-11mm. Kovdorskite is a very rare mineral found at this locality only where it occurs in an explosive breccia pipe intruded through an iron deposit. Note labels.
