Rare Mineral Specimens - search page
- Durant mine, Aspen dist., Pitkin Co., Colorado, United States
- 6.5 x 3 x 3 cm - Sm Cabinet
- sulfide, silver
A heavy mass of dark grey Acanthite with portions of obscure Silver. You have to look hard to see the Silver. An old-timer from the John Albanese collection then to Hampson in 1965.
- Poison Canyon mine, Lake Ambrosia dist., McKinely Co., New Mexico, United States
- 3 x 2.5 x 0.3 cm - Thumbnail
- Special Info
Canary yellow micro crystals less than 1mm. This is a very thin plate.
- Silver Crater mine, Bancroft, Ontario, Canada
- 3 x 3.5 x 3 cm - Miniature
Once known simply as the mineral species, Betafite, now in a complex mineral group called the Betafite group, which belongs to the super group of Pyrochlores with a complicated nomenclature. Compositionally, Betafites are oxides of titanium and niobium with variable subtitutions of cations uranium and calcium in the A position and variable amounts of anions O, OH, H2O, or F in the Z position.
This is one of the best Betafites I have ever seen. There are several crystals in this cluster with the biggest at the base which is about 3cm across. The crystal perched on top is 1cm across.