Strontianite
ID: 55
Strontianite
Chemical Formula
SrCO₃
Hardness (Mohs)
3.5 - 4
Crystal System
Orthorhombic
Streak
White
Luster
Vitreous to resinous.
Diaphaneity
Transparent to translucent
Color
Typically colorless, white, gray, yellowish, or greenish.
Crystal Habit / Mode of Occurrence
Commonly occurs as radiating fibrous aggregates, also prismatic crystals (often acicular - needle-like), tabular, and massive. Twinning is common, often resulting in pseudohexagonal forms.
Fun Facts
It's the primary ore of strontium, which is famously used to produce the vibrant red color in fireworks and flares.