Demartinite Mineral Data

General Demartinite Information
Chemical Formula:	K2[SiF6]
Composition:	Molecular Weight = 220.26 gm
	Potassium 35.50 % K 42.77 % K₂O
	Sodium 0.21 % Na 0.28 % Na₂O
	Silicon 12.62 % Si 27.01 % SiO₂
	Fluorine 51.67 % F 51.67 % F
	- % F -21.76 % -O=F₂
	______ ______
	100.00 % 99.96 % = TOTAL OXIDE
Empirical Formula:	K₂Na_0.02Si_0.99F_5.99
Environment:	Collected in April 2006 from a fumarole at the crater rim. Polymorphous with hieratite.
IMA Status:	Approved IMA 2006 (Dana # Added)
Locality:	La Fossa crater, Vulcano, Eolian Islands, Italy. Link to MinDat.org Location Data.
Name Origin:	Named for Francesco Demartin (b. 1953), who has made significant contributions to the chemistry of metallic clusters and to the crystal structure of Alpine rare-earth minerals and u ranium minerals.
Synonym:	IMA2006-034