Ordóñezite
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Ordóñezite is a tetragonal pyramidal crystal and is found in Rhyolite fractures. The Santín mine which is located about eight kilometres from Santa Catarina, Guanajuato, Mexico is a main producer of Ordóñezite. Another is El Antimonio, 27 kilometres southwest of Agua Prieta, Sonora, Mexico.
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[edit] Discovery
Ordóñezite was first discovered and documented by Ezequiel Ordóñez (1867-1950), a Mexican geologist, formerly director of the Geological Institute of Mexico.
[edit] Properties
Optical properties include: semitransparent, very light to very dark colorless to pearl-gray, light yellowish olive to dark olive.
Chemical Formula: ZnSb2O6
Composition: Molecular Weight = 404.89 gm.
Proportions:
- Zinc, 16.15%
- Antimony, 60.14%
- Oxygen 23.17%
or, alternatively:
- Zinc (as ZnO), 20.10%
- Antimony (as Sb2O5), 79.90%
