Landesite Mineral Data

General Landesite Information
Chemical Formula:	(Mn,Mg)9Fe+++3(PO4)8(OH)3•9(H2O)
Composition:	Molecular Weight = 1,565.99 gm
	Magnesium 3.49 % Mg 5.79 % MgO
	Manganese 23.68 % Mn 30.58 % MnO
	Iron 10.70 % Fe 13.76 % FeO
	Phosphorus 15.82 % P 36.26 % P₂O₅
	Hydrogen 1.35 % H 12.08 % H₂O
	Oxygen 44.95 % O
	______ ______
	100.00 % 98.47 % = TOTAL OXIDE
Empirical Formula:	9(Mn²⁺_0.75)9(Mg_0.25)Fe²⁺₃(PO₄)₈(OH)₃•9(H₂O)
Environment:	Replacing reddingite in a complex granite pegmatite (Berry quarry, Maine, USA).
IMA Status:	Valid Species (Pre-IMA) 1930
Locality:	Berry quarry, Poland, Androscoggin Co., and the Emmons quarry, Greenwood, Oxford Co., Maine. Link to MinDat.org Location Data.
Name Origin:	Named for Kenneth Knight Landes (1899-1984), Professor of Geology, University of Michigan, Ann Arbor, Michigan, USA, for his study of Maine pegmatites.
Name Pronunciation:	Landesite + Pronunciation
Synonym:	ICSD 31146
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