Object ID:
1917.8.37
Collection:
Natural History-Ladies of New London
Object Name:
Schist
Dimensions:
H-2.3 W-1.4 L-4 cm
Description:
Many elongated tourmaline minerals with vertical striations, hexagonal in cross section, in mica schist
Other Name:
Tourmaline Mica
Rock Type:
Metamorphic
Found:
Near Custer, Black Hills, South Dakota
Chemical Composition:
Complex borosilicate
Crystal System:
Hexagonal
Specific Gravity:
3.0-3.25
Hardness:
07
Luster:
Vitreous
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