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.

Contents 1 Discovery 2 Properties 3 See also 4 External links

[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%

[edit] See also

• International Mineralogical Association
• List of minerals N-R (complete)

[edit] External links

• Santin mine