Oxystannomicrolite

oxystannomicrolite

cassiterite

ferrowodginite

bismuth

Images

Formula: Sn₂Ta₂O₆O
Oxide of tin and tantalum, microlite group, pyrochlore supergroup
Crystal System: Isometric
Specific gravity: 8.34 measured, 8.21 calculated from ideal formula
Hardness: 7
Colour: Yellowish brown with reddish brown internal reflections
Environments

Pegmatites

Localities

At the type locality, Sukula Pegmatites, Tammela, Kanta-Häme, Finland, oxystannomicrolite occurs in the granite pegmatite as narrow rims around ferrowodginite, and in small grains replacing ferrowodginite almost completely. Associated minerals include cassiterite, ferrowodginite and native bismuth
(Mindat).

At Alto Ligonha Pegmatite Field, Zambezia Province, Mozambique, oxystannomicrolite has been found (Mindat photo).
Oxystannomicrolite from Alto Ligonha Pegmatite Field - Image

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