Montebrasite Mineral Data

General Montebrasite Information
Chemical Formula:	LiAl(PO4)(OH,F)
Composition:	Molecular Weight = 146.40 gm
	Lithium 4.74 % Li 10.21 % Li₂O
	Aluminum 18.43 % Al 34.82 % Al₂O₃
	Phosphorus 21.16 % P 48.48 % P₂O₅
	Hydrogen 0.52 % H 4.61 % H₂O
	Oxygen 51.91 % O
	Fluorine 3.24 % F 3.24 % F
	- % F -1.37 % -O=F₂
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	LiAl(PO₄)(OH)_0.75F_0.25
Environment:	Forms large-sized crystals in lithium-bearing pegmatites. Species and name natromontebrasite are discredited because natromontebrasite is a mixture of OH-rich amblygonite with lacro ixite and subordinate wardite
IMA Status:	Discredited IMA 2005 No. 05-E
Locality:	Montebras, Creuse, France. Link to MinDat.org Location Data.
Name Origin:	Named for the locality in 1872.
Name Pronunciation:	Montebrasite + Pronunciation