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Bismutocolumbite & Elbaite

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Bismutocolumbite & Elbaite

Analysed
Type Locality

Description Tabs

Description
Locality: 
Danburitovaya Pegmatite, Malkhan, Krasnochikoysky District, Zabaykalsky Krai, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.9 × 0.65 × 0.5 cm
Description

Nice specimen of extremely rare (known from only three locations and in small samples) black, sub-metallic, broken crystal of Bismutocolumbite (almost 3x2 mm) in white Albite with small pale pinkish-yellow Elbaite on the back side. Analysed 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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