Tacharanite Mineral Data

General Tacharanite Information
Chemical Formula:	Ca12Al2Si18O33(OH)36
Composition:	Molecular Weight = 2,180.68 gm
	Calcium 22.05 % Ca 30.86 % CaO
	Aluminum 2.47 % Al 4.68 % Al₂O₃
	Silicon 23.18 % Si 49.60 % SiO₂
	Hydrogen 1.66 % H 14.87 % H₂O
	Oxygen 50.62 % O
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Ca₁₂Al₂Si₁₈O₃₃(OH)₃₆
Environment:	In vesicles or fractures in dolorites or other basic igneous rocks.
IMA Status:	Approved IMA 1961
Locality:	Portree, Isle of Skye, Scotland. Link to MinDat.org Location Data.
Name Origin:	Named from the Gaelic "tacharan," a changeling, because on standing in air the mineral breaks down to form other compounds (not noticed by later investigators).
Name Pronunciation:	Tacharanite + Pronunciation