Tobelite Mineral Data

General Tobelite Information
Chemical Formula:	(NH4,K)Al2(Si3Al)O10(OH)2
Composition:	Molecular Weight = 376.27 gm
	Potassium 2.08 % K 2.50 % K₂O
	Aluminum 20.08 % Al 37.94 % Al₂O₃
	Silicon 23.89 % Si 51.10 % SiO₂
	Hydrogen 0.54 % H - % Calc as (NH₄)₂O
	Hydrogen 0.54 % H 4.79 % H₂O
	Nitrogen 1.86 % N 3.46 % (NH₄)₂O
	Oxygen 51.03 % O
	______ ______
	100.00 % 99.79 % = TOTAL OXIDE
Empirical Formula:	(NH₄)_0.5K_0.2Al₂Si_3.2Al_0.8O₁₀(OH)₂
Environment:	Hydrothemal alteration of biotite andesite dike or in a hydrothermally altered rhyolite tuff.
IMA Status:	Approved IMA 1982
Locality:	Ohgidani pottery stone deposit, Tobe, Ehime Prefecture, adn in the Horo pryophyllite deposit, Toyosaka, hiroshima Prefecture, Japan. Link to MinDat.org Location Data.
Name Origin:	Named for the locality.
Name Pronunciation:	Tobelite