General Information:
Chemical Formula:
Zn2(AsO4)(OH)·(H2O)
Composition:
(Molecular Weight = 304.72 gm)
Zinc 42.92 % Zn
Arsenic 24.59 % As
Hydrogen 0.99 % H
Oxygen 31.50 % O
Empirical Formula:
Zn2(AsO4)(OH)·(H2O)
Environment:
Secondary mineral in zinc orebodies.
Locality:
Ojuela mine near Mapimi, Durango.
Name Origin:
Named after the Belgian mining engineer, Legrande.
Physical Properties:
Cleavage:
[100] Imperfect
Color:
yellow or yellowish orange.
Density:
4
Diaphaniety:
Translucent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
Streak:
white
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