Ordoñezite

Ordoñezite or ordóñezite is a rare tetragonal zinc antimonate mineral with chemical formula: ZnSb2O6.

Ordóñezite
General
CategoryAntimonate mineral
Formula
(repeating unit)
ZnSb2O6
IMA symbolOrd[1]
Strunz classification4.DB.10
Crystal systemTetragonal
Crystal classDitetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
Space groupP42/mnm
Unit cella = 4.66 Å, c = 9.26 Å; Z = 2
Identification
ColorVery light to very dark brown, colorless to pearl-gray, light yellowish olive to dark olive
Crystal habitPyramidal crystals in drusy or stalactitic masses
TwinningCommon on {013}
FractureConchoidal
Mohs scale hardness6.5
LusterAdamantine
DiaphaneitySemitransparent
Specific gravity6.635
Optical propertiesUniaxial (+)
Refractive indexN(calculated) = 2.02 - 2.04
References[2][3][4][5]

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.[3] Another locality is El Antimonio, 27 km (17 mi) southwest of Agua Prieta, Sonora, Mexico.[4]

Properties

Optical properties include: semitransparent, very light to very dark colorless to pearl-gray, light yellowish olive to dark olive.

References


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