Tellurite
Mineral
Tellurite is a rare oxide mineral composed of tellurium dioxide.
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,... Wikipedia
Birefringence: δ = 0.350
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal habit: Flattened prismatic to acicular crystals, radiating groups; powdery, massive
Crystal system: Orthorhombic
Optical properties: Biaxial (-)
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