Tellurite (mineral)
(repeating unit)TeO2 IMA symbol Tlr[1] Strunz classification 4.DE.20 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pbca Unit cell a = 5.6 Å, b = 12.03 Å
c = 5.46 Å; Z = 8 Identification Color Yellow to white Crystal habit Flattened prismatic to acicular crystals, radiating groups; powdery, massive Cleavage Perfect on {010} Tenacity Flexible Mohs scale hardness 2 Luster Sub-adamantine Diaphaneity Transparent to opaque Specific gravity 5.88 - 5.92 Optical properties Biaxial (-) Refractive index nα = 2.000 nβ = 2.180 nγ = 2.350 Birefringence δ = 0.350 Solubility Slight in water References [2][3][4]
H-M symbol: (2/m 2/m 2/m)
c = 5.46 Å; Z = 8
Tellurite is a rare oxide mineral composed of tellurium dioxide (TeO2).
It occurs as prismatic to acicular transparent yellow to white orthorhombic crystals. It occurs in the oxidation zone of mineral deposits in association with native tellurium, emmonsite and other tellurium minerals. Its name comes from Tellus, which is the Latin name for the planet Earth.[3][4]
It was first described in 1842 because of an occurrence in Faţa Băii, Zlatna, Alba County, Romania.[4]
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