General Information:
Chemical Formula:
TlAsS2
Composition:
(Molecular Weight = 343.44 gm)
Thallium 59.51 % Tl
Arsenic 21.82 % As
Sulfur 18.67 % S
Empirical Formula:
TlAsS2
Locality:
Allchar, near Rozdan, northwest of Salonika, Macedonia.
Physical Properties:
Cleavage:
[100] Perfect, [001] Distinct
Color:
red, carmine red, or blackish lead gray.
Density:
5.5288 - 5.5362, Average = 5.53
Diaphaniety:
Subtransparent
Habits:
Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Streak:
red
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