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Clintonite with Vesuvianite

#27844

Clintonite with Vesuvianite

#27844
Availability
Sold
Size
5.5 x 4 x 2 cm - Sm Cabinet 
Formula
CaAlMg2(SiAl3)O10(OH)2 (RRUFF)
Locality
Commercial quarry, Crestmore, Riverside Co., California, United States

Green to light yellow green 3-5mm plates of Clintonite, a brittle mica. Brittle micas do have flexible plates, so this is a hint to its identification.

Clintonite is a phyllosilicate, a mica group member subclassified as a brittle, trioctahedral Mica. Ca, Na, K occupies the interlayer positions while Mg, Fe2+, Al, Fe3+, Mn in the octahedral positions.

Clintonite occurs as tabular, pseudohexagonal, foliated, lamellar radiate crystals. Occurs cheifly in association with calcite, idocrase, grossular, spinel, phlogopite in crystalline limestones i.e. Crestmore (Encycl. of Min.)

Clintonite

Formula
CaAlMg2(SiAl3)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Lamellar, Radial 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
colorless, green, yellow, red, reddish brown 
Streak
colorless 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4-5 

Data courtesy of Webmineral.

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