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Bismutocolumbite & Elbaite

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Bismutocolumbite & Elbaite

Type Locality
Analysed

Description Tabs

Description
Locality: 
Malkhan, Krasnyi Chikoy, Zabaykalsky Krai, Russian Federation
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.9 × 1.2 × 0.9 cm
Description

Nice specimen of extremly rare (know only from three locations and in small samples!) black, sub-metallic grains  (there is at least two of them, the bigger one is 1 mm) of Bismutocolumbite with small pale pinkish-yellow Elbaite crystals on Albite matrix. Analyzed specimen from Type Locality!

Mineral Data
What's on the rock

Bismutocolumbite

Formula: 
Bi(Nb,Ta)O4
Strunz: 
4.DE.30
Crystal System: 
Orthorhombic
Hardness: 
5.5
Type Locality: 
Danburitovaya pegmatite vein, Malkhan pegmatite field (Malchan; "Malechansk"), Krasnyi Chikoy, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia...

Elbaite

Formula: 
Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.5
Streak: 
White
Type Locality: 
Fonte del Prete, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy...

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