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Clinochlore

General Information
Varieties/Types:
Seraphinite - A green to grey massive clinochlore, appears somewhat feathery in structure.
Chemical Formula
(Mg,Fe
2+
 
)
 
5
Al(Si
 
3
Al)O
 
10
(OH)
 
8
Anthony et al, Handbook of mineralogy (2001)
Physical Properties of Clinochlore
Mohs Hardness2 to 2.5
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity2.60 to 3.02
Anthony et al, Handbook of mineralogy (2001)
TenacityFlexible
Anthony et al, Handbook of mineralogy (2001) Laminae, inelastic.
Cleavage QualityPerfect
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Clinochlore
Refractive Index1.571 to 1.597
Anthony et al, Handbook of mineralogy (2001)
Optical CharacterBiaxial/+,-
Anthony et al, Handbook of mineralogy (2001)
PleochroismDistinct: light yellow-green to light blue-green - light greenish yellow to light blue-green.
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Grass-green, olive-green, yellowish, white; pink, rose-red; colorless to pale green or yellow in thin section.
Anthony et al, Handbook of mineralogy (2001)
TransparencyTransparent,Translucent
Anthony et al, Handbook of mineralogy (2001)
LustrePearly,Greasy,Dull (Earthy)
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Clinochlore
Crystal SystemMonoclinic
Anthony et al, Handbook of mineralogy (2001)
HabitIn thin to thick pseudohexagonal crystals, with tapering pyramidal faces, to 10 cm. Commonly foliated, fibrous, granular, earthy, massive.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:A hydrothermal alteration product of amphiboles, pyroxenes, biotite. In chlorite schists, serpentinites, marbles, calc-silicate rocks, amphibolites, less commonly in ultramafic rocks. In ore veins; a detrital component of sediments.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Clinochlore information at mindat.org
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