Shibkovite Mineral Data

General Shibkovite Information
Chemical Formula:	K(Ca,Mn,Na)2(K2-x,[ ]x)2ZnSi12O30 (x~0.8)
Composition:	Molecular Weight = 1,180.17 gm
	Potassium 7.29 % K 8.78 % K₂O
	Sodium 0.58 % Na 0.79 % Na₂O
	Calcium 4.41 % Ca 6.18 % CaO
	Manganese 1.86 % Mn 2.40 % MnO
	Zinc 16.62 % Zn 20.69 % ZnO
	Silicon 28.56 % Si 61.09 % SiO₂
	Oxygen 40.67 % O
	______ ______
	100.00 % 99.93 % = TOTAL OXIDE
Empirical Formula:	K_2.2Ca_1.3Mn²⁺_0.4Na_0.3Zn₃Si₁₂O₃₀
Environment:	Found in a boulder of perialkaline granitic pegmatite in moraine. A member of the Osumilite-Milarite group.
IMA Status:	Approved IMA 1998 (Dana # Added)
Locality:	Dara-i-Pioz glacier, Garmsky District, northern Tajikistan. Link to MinDat.org Location Data.
Name Origin:	Named after two prominent Russian geologists, Viktor Sergeevitch Shibkov (1926-1992) and Nikolai Viktorovitch Shibkov (1951-1991), who both spent their professional lives working on the geology of Soviet Asia.
Synonym:	ICSD 87953
	IMA1997-018
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