Altaite

Altaite also known as lead telluride is a yellowish white mineral with an isometric crystal structure. Altaite is in the galena group of minerals as it shares many of properties of galena. Altaite has an unusually high density for a light colored mineral. Altaite and other rare tellurides are classified in the sulfide mineral class (Dana classification).
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General Information:
 Chemical Formula:
PbTe
 Composition:
(Molecular Weight = 334.80 gm)
Tellurium 38.11 % Te
Lead 61.89 % Pb
 Empirical Formula:
PbTe
 Locality:
TL: Ziryanovsk in the Altai Mountains, Siberia.
 Name Origin:
Named after its locality.
Physical Properties:
 Cleavage:
[001] Perfect, [010] Perfect, [100] Perfect
 Color:
tin white, yellowish tin white, or bronze yellow.
 Density:
8.1 - 8.2, Average = 8.14
 Diaphaniety:
Opaque
 Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock.,
 Hardness:
2.5 - Finger Nail
 Luminescence:
None.
 Luster:
Metallic
 Streak:
black
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