Protoferro-anthophyllite Mineral Data

General Protoferro-anthophyllite Information
Chemical Formula:	(Fe++,Mn++)2(Fe++,Mg)5(Si4O11)2(OH)2
Composition:	Molecular Weight = 969.16 gm
	Magnesium 2.51 % Mg 4.16 % MgO
	Manganese 5.67 % Mn 7.32 % MnO
	Iron 28.81 % Fe 37.07 % FeO
	Silicon 23.18 % Si 49.60 % SiO₂
	Hydrogen 0.21 % H 1.86 % H₂O
	Oxygen 39.62 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Fe²⁺₅Mn²⁺MgSi₈O₂₂(OH)₂
Environment:	Occurs in blocks of fayalite.
IMA Status:	Approved IMA 1998 (Dana # Added)
Locality:	Cheyenne Moutain area, El Paso County, Colorado, USA. Found in bedded Mn deposits at Yokoneyama, Tochigi Prefecture, Japan, and also in a pegmatite at Suishoyame, Fukushima Prefecture Link to MinDat.org Location Data.
Name Origin:	The name indicates the structural relationship to protoamphiboles, and the compositional relationship to anthophyllite.
Name Pronunciation:	Protoferro-anthophyllite + Pronunciation
Synonym:	IMA1986-006