M.J. Hibbard
Anhydrite


Anhydrite   CaSO4    Orthorhombic
o Hydrothermal (precipitation) and parametamorphic environments (chapters 12, 14, and 18)
- Recrystallized anhydrite-calcite rock. Cleavage-controlled plucking of large central anhydrite crystal occurred during preparation of thin section, generating variable thicknesses within the anhydrite. This accounts for the variable presenting birefringence (ranging from 1st order white to 2nd order blue). Note twin lamella in the anhydrite grains. Thin section view (XP)(0.6 mm wide).

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