Permanganogrunerite Mineral Data

General Permanganogrunerite Information
Chemical Formula:	[ ]Mn4(Fe++)3(Si8O22)(OH)2
Composition:	Molecular Weight = 997.98 gm
	Manganese 22.02 % Mn 28.43 % MnO
	Iron 16.79 % Fe 21.60 % FeO
	Silicon 22.51 % Si 48.16 % SiO₂
	Hydrogen 0.20 % H 1.81 % H₂O
	Oxygen 38.48 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Mn²⁺₄Fe²⁺₃Si₈O₂₂(OH)₂
IMA Status:	Proposed IMA 1997 (Dana # Added)
Locality:	Link to MinDat.org Location Data.
Name Origin:	Named as per current IMA amphibole nomenclature (Burke and Leake 2004; Can. Mineral., 42, 1881-1883). Dashkensanite (1936) was revalidated and renamed 2005.
Name Pronunciation:	Permanganogrunerite + Pronunciation