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0 item @ $0.00  

Andalusite var. chiastolite

#WR53990

Andalusite var. chiastolite

#WR53990
Availability
Sold
Size
2 x 2 x 2.5 cm - Thumbnail 
Formula
Al2OSiO4 (RRUFF)
Locality
Lancaster, Worcester Co., Massachusetts, United States

A section of an Andalusite crystal, sawed and polished on both ends to show the cross-shaped inclusions of black graphite caused during crystal growth. 

This is a first-rate specimen of the Andalusite, variety chiastolite.

Andalusite

Formula
Al2OSiO4 
Crystal System
Orthorhombic 
Crystal Habit
Blocky, Prismatic, Euhedral Crystals 
Cleavage
Distinct, Indistinct, Poor 
Luster
Vitreous (Glassy) 
Color
dark green, gray, brown, red, green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Splintery 
Hardness
6.5-7 

Data courtesy of Webmineral.

Collection
Willard L. Roberts Collection

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