Foordite Mineral Data

General Foordite Information
Chemical Formula:	Sn++(Nb,Ta)2O6
Composition:	Molecular Weight = 444.54 gm
	Tantalum 20.35 % Ta 24.85 % Ta₂O₅
	Niobium 31.35 % Nb 44.85 % Nb₂O₅
	Tin 26.70 % Sn 30.30 % SnO
	Oxygen 21.59 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	SnNb_1.5Ta_0.5O₆
Environment:	Alluvial pebble originating from a highly differentiated granite pegmatite, formed under reducing conditions deficient in Fe, Mn, Na, Ca, and F
IMA Status:	Approved IMA 1988
Locality:	15 km north-northwest of Lutsiro, near the Sebeya River, western Rwanda. Link to MinDat.org Location Data.
Name Origin:	Named for Eugene Edward Foord (1946-1998), American mineralogist with the U.S. Geological Survey, Denver, Colorado, USA, student of granite pegmatites.
Name Pronunciation:	Foordite
Synonym:	ICSD 202827
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