Benjaminite

#65326

SOLD

Availability: Sold

Locality: Outlaw mine, Nye Co., Nevada, United States
Formula: Ag₃Bi₇S₁₂
Size: 2 x 2 x 0.6 cm - Thumbnail
Tagged: sulfide, silver

Silvery crystalline masses. Rich.

Benjaminite at WebMineral Benjaminite at MinDat

Berborite

#64387

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Availability: Sold

Locality: Vevja quarry, Tvedalen, Larvik, Vestfold, Norway
Formula: Be₂BO₃(OH)·H₂O
Size: 3 x 2 x 2 cm - Thumbnail
Tagged: beryllium

Thick prismatic crystal group to 1mm amogst waterclear Natrilite crystals.

Berborite at Dakota Matrix Berborite at WebMineral Berborite at MinDat

Berezanskite

#BAC65357

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Availability: Sold

Locality: Dara-i-Pioz Massif, Tajikistan
Formula: KTi₂(Li₃Si₁₂)O₃₀
Size: 1.5 x 1 x 0.7 cm - Thumbnail
Tagged: lithium
Special Info: Type Locality

Colorless anhedral crystal grain to about 0.75mm. If not for the arrow. The original tag comes with what appears to be signature. Very rare.

Berezanskite at WebMineral Berezanskite at MinDat

Betafite

#64434

Availability: Available
Price: $75.00

Locality: Silver Crater mine, Bancroft, Ontario, Canada
Formula: A₂(Ti,Nb)₂O₆Z
Size: 2 x 2 x 2 cm - Thumbnail
Special Info: Radioactive!!

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 specimen, like the others show the cubic and octahedral forms with sharp edges.

Betafite at Dakota Matrix Betafite at WebMineral Betafite at MinDat