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Microlite
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Microlite was once known as a pale-yellow, reddish-brown, or black isometric mineral composed of sodium calcium tantalum oxide with a small amount of fluorine. Its chemical formula is (Na, Ca)₂Ta₂O₆. Wikipedia
Crystal system: Cubic
Formula (repeating unit): (Na,Ca)2Ta2O6(O,OH,F)
IMA symbol: Mic
Space group: Fd3m (no. 227)