General Information:
Chemical Formula:
Pb3H2(Te++++O3)(Te++++++O6)
Composition:
(Molecular Weight = 1,022.81 gm)
Tellurium 24.95 % Te
Hydrogen 0.20 % H
Lead 60.77 % Pb
Oxygen 14.08 % O
Empirical Formula:
Pb3H2(TeO3)(TeO6)
Environment:
Secondary tellurate.
IMA Status:
Approved IMA 1979
Locality:
Grand Central mine, Tombstone, Arizona, USA.
Name Origin:
Named for Richard Gird (1836-1910), mining engineer and assayer, who made the first rich silver assays and helped open up the Tombstone district.
Physical Properties:
Color:
white or lemon white.
Density:
5.5
Diaphaniety:
Translucent
Habits:
Spherical - Spherical, rounded aggregates., ,
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Streak:
white
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