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Cordierite variety Cerasite

#PD33745

Cordierite variety Cerasite

#PD33745
Availability
Sold
Size
3 x 4 x 1.5 cm - Miniature 
Formula
Mg2Al4Si5O18 (RRUFF)
Locality
Kyoto prefecture, Honshu Island, Japan

A cyclically twinned Cordierite crystal to 7mm that has been replaced by platy Micas, pinite or sericite. The name Cerasite may actually be Sericite, which at some point became the varietal name.

This piece comes with a label with what appear to be Japanese characters, although I don't really know, I'd be interested to know the translation for.

Cordierite

Formula
Mg2Al4Si5O18 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Poor, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale blue, violet, yellow, gray 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection

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