- Ordóñezite
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Ordóñezite General Category Antimonate mineral Chemical formula ZnSb2O6 Strunz classification 04.DB.10 Crystal symmetry Tetragonal 4/m 2/m 2/m Unit cell a = 4.66 Å, c = 9.26 Å; Z = 2 Identification Color Very light to very dark brown, colorless to pearl-gray, light yellowish olive to dark olive Crystal habit Pyramidal crystals in drusy or stalactitic masses Crystal system Tetragonal ditetragonal dipyramidal Twinning Common on {013} Fracture Conchoidal Mohs scale hardness 6.5 Luster Adamantine Diaphaneity Semitransparent Specific gravity 6.635 Optical properties Uniaxial (+) Refractive index N(calculated) = 2.02 - 2.04 References [1][2][3] Ordóñezite is a rare tetragonal zinc antimonate mineral with chemical formula: ZnSb2O6.
Contents
Discovery
Ordóñezite was first discovered and documented by Ezequiel Ordóñez (1867-1950), a Mexican geologist, formerly director of the Geological Institute of Mexico. It was first described in 1953 for an occurrence with cassiterite in veins in rhyolite in the Santín mine which is located about eight kilometres from Santa Catarina, Guanajuato, Mexico.[1] Another locality is El Antimonio, 27 km southwest of Agua Prieta, Sonora, Mexico.[2]
Properties
Optical properties include: semitransparent, very light to very dark colorless to pearl-gray, light yellowish olive to dark olive.
References
External links
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