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Mineralpedia Details for Scapolite

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Scapolite

Scapolite

Named for the Greek words skapos, meaning “digger,” and lithos, meaning “stone.”Scapolite is one of the transitional members of the Marialite-Meionite series, and the term will generally be used to refer to the series, not the Scapolite Group. It appears as colorless to pale yellow, yellow, brown, violet, pink, etc., prismatic crystals, or as granular or massive. Scapolite will fluoresce yellow to orange under both short-wave and long-wave ultraviolet light. Scapolite is “a characteristic mineral, formed during regional metamorphism, under conditions of the almandine amphibolites metamorphic facies and of the granulite facies,” as well as during regional and contact metamorphism that is connected to metasomatism. It can be found in pegmatites cutting serpentinite, marble, or skarn, hybrid pegmatite-like rock, skarn, calc-silicate hornfelses, metamorphic marble, and in altered gabbro and nepheline syenite. There are hundreds of widespread, worldwide localities for Scapolite.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and American Mineralogist 81 (1996), 169

Formula
(Na,Ca)4[(Al,Si)12O24]Cl 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Prismatic 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous (Glassy) 
Color
white, gray, pale brown, pink, yellow 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Splintery 
Hardness
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Mindat
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Scapolite from Rakhuie, near Lajuar Madan, Kokcha Valley, Badakhshan, Afghanistan

Scapolite
            from Rakhuie, near Lajuar Madan, Kokcha Valley, Badakhshan, Afghanistan

Well formed, beautiful lilac colored, gemmy Scapolite to 2.5cm on a marble base.

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