Chabazite

Chabazite is named after Greek "chabazios" - tune or melody, one of twenty stones named in the poem "Peri lithos", which extolled the virtues of minerals (Orpheus, Greece, early centuries AD).

Chabazite forms transparent to translucent, brown, pink, reddish, yellowish, orange, white and colourless crystals that resemble slightly squashed cubes. Aggregates form crusts and granular masses.

Chabazite is rarely faceted because clean facet rough is scarce.
General Information
Chemical Formula
CaAl
 
2
Si
 
4
O
 
12
-6H
 
2
O
Arthur Thomas, Gemstones (2009)
Photos of natural/un-cut material from mindat.org
Physical Properties of Chabazite
Mohs Hardness4.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.08 to 2.16
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Chabazite
Refractive Index1.478 to 1.490
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.005 to 0.008
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismNil
Arthur Thomas, Gemstones (2009)
DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, white, reddish, brownish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Bright green
Arthur Thomas, Gemstones (2009)
Crystallography of Chabazite
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitRhombohedral, pseudo-cubic
Arthur Thomas, Gemstones (2009)
Geological Environment
Where found:Forms in gas cavities in extrusive volcanic rocks and also as precipitate in and around hot springs.
Arthur Thomas, Gemstones (2009)
Further Information
Mineral information:Chabazite information at mindat.org
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