General Information:
Chemical Formula:
Hg2Cl2
Composition:
(Molecular Weight = 472.09 gm)
Mercury 84.98 % Hg
Chlorine 15.02 % Cl
Empirical Formula:
Hg2Cl2
Environment:
Oxidized mercury deposits.
Locality:
Terlingua, Brewster Co., Texas, USA.
Name Origin:
From the Greek, kalos - "beautiful" and melas - "black."
Physical Properties:
Cleavage:
[100] Poor, [011] Poor
Color:
white, yellowish gray, gray, yellowish white, or brown.
Density:
6.4 - 6.5, Average = 6.45
Diaphaniety:
Translucent to subtranslucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Fluorescent.
Luster:
Adamantine - Resinous
Streak:
pale yellowish white
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