General Information:
Chemical Formula:
CaB2(SiO4)2
Composition:
(Molecular Weight = 245.86 gm)
Calcium 16.30 % Ca
Silicon 22.85 % Si
Boron 8.79 % B
Oxygen 52.06 % O
Empirical Formula:
CaB2Si2O8
Environment:
Contact metamorphic rocks.
Locality:
Danbury, Connecticut.
Name Origin:
Named after its location.
Physical Properties:
Cleavage:
[001] Poor
Color:
colorless, white, gray, brownish white, or straw yellow.
Density:
2.97 - 3.02, Average = 2.99
Diaphaniety:
Transparent to translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Disseminated - Occurs in small, distinct particles dispersed in matrix., Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Hardness:
7 - Quartz
Luminescence:
Fluorescent.
Luster:
Vitreous - Greasy
Streak:
white
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