General Information:
Chemical Formula:
SiO2
Composition:
(Molecular Weight = 60.08 gm)
Silicon 46.74 % Si
Oxygen 53.26 % O
Empirical Formula:
(SiO2)
Environment:
Cavities in volcanic rocks.
Locality:
Occurs world wide.
Name Origin:
From the Greek Tridymos - "triplex."
Physical Properties:
Cleavage:
[0001] Indistinct, [1010] Imperfect
Color:
colorless, white, yellowish white, or gray.
Density:
2.28 - 2.33, Average = 2.3
Diaphaniety:
Transparent to translucent
Habits:
Spherical - Spherical, rounded aggregates., Platy - Sheet forms (e.g. micas).,
Hardness:
6.5-7 - Pyrite-Quartz
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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