Apatite (thin section)

Key Characteristics: Moderate to high relief, lack of color, low birefringence and uniaxial character are key features 2V: n/a Relief: Moderate to high positive relief Cleavage: Not observed in thin section Colour and Plechroism: Most commonly colorless in thin section; Grains from deeply colored specimens may exhibit pale coloration; Weak to moderate pleochroism possible if colored Optical Orientation: Parallel extinction Twinning: None Optical character: Uniaxial (-)