Strontianite crystals Peter Tarassoff sp. At MSH, strontianite is a rare mineral in igneous breccia cavities and hornfels.
Color varies from colorless to white.
Luster is vitreous to silky. Diaphaneity is transparent to translucent, opaque on white crystals. Crystal Habits include the sharp tabular twinned crystals to 4 mm and radiating sprays of acicular crystals to 12mm in length. Fracture is uneven to subconchoidal. Streak is white.