Leucophanite

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Leucophanite
Leucophanite, Aegirine-175723.jpg
The leucophanite on an aegirine needle (about 4-5 mm on edge)
General
Category Inosilicates
Formula
(repeating unit)
(Na,Ca)2BeSi2(O.OH.F)7
Strunz classification 9.DH.05
Crystal system Orthorhombic
Crystal class Disphenoidal (222)
(same H-M symbol)
Space group P212121
Identification
References [1][2][3][4][5]

Leucophanite is an inosilicate mineral with a complex composition, (Na,Ca)2BeSi2(O.OH.F)7. It may contain cerium substituting in the calcium position.

It occurs in pegmatites and alkali igneous complexes as yellow, greenish or white triclinic crystals and has been found in Norway, Quebec and Russia.

It was first described from the Langesundfiord district of southern Norway in 1840. The name is from the Greek leucos for "white" and phanein for "to appear" in allusion to the common white color.

References[edit]