Roedderite Mineral Data

General Roedderite Information
Chemical Formula:	(Na,K)2(Mg,Fe++)5Si12O30
Composition:	Molecular Weight = 1,031.99 gm
	Potassium 1.89 % K 2.28 % K₂O
	Sodium 3.34 % Na 4.50 % Na₂O
	Magnesium 8.83 % Mg 14.65 % MgO
	Iron 6.76 % Fe 8.70 % FeO
	Silicon 32.66 % Si 69.87 % SiO₂
	Oxygen 46.51 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Na_1.5K_0.5Mg_3.75Fe²⁺_1.25Si₁₂O₃₀
Environment:	In vesicles in contact metamorphosed basement gneiss xenoliths in leucite tephrite (Bellerberg volcano, Germany); an accessory mineral in an enstatite chondrite (Indarch meteorite). Forms a series with eifelite.
IMA Status:	Approved IMA 1966
Locality:	In the Indarch, Witchita County, and Canyon Diablo meteorites. Link to MinDat.org Location Data.
Name Origin:	Named for Edwin Woods Roedder (1919- ), mineralogist, U.S. Geological Survey, who noted the synthetic compound.
Name Pronunciation:	Roedderite + Pronunciation
Synonym:	ICSD 68545
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