Chesterite

Formula:  (Mg,Fe)17Si20O54(OH)6

Origin of name:  Locality; Chester, Vermont

 

Crystal system:  Orthorhombic

Crystal class:  mm2

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Colour:  Colourless to light pinkish brown

Diaphaneity:

Luster: 

Habit:  Crystals prismatic in radiating sprays

Hardness:

Specific gravity:  3.23

Cleavage:  1; {110} perfect

Tenacity:

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