Color: Pink to peach

Moh’s Hardness: 7.5-8

Refractive Index: 1.57-1.60

Critical Angle: 39.87°

Specific Gravity: 2.65-2.75

Cleavage: None

Fracture: Conchoidal, tough

Dispersion: Medium (.014)

Heat Sensitivity: Slightly

Dichroism: distinct (pale-pink to lavender-pink)

Birefringence (double refraction): Weak (.006-.009)

Crystal Structure: Hexagonal

Treatments: Generally none, although it is sometimes heated to improve color.