Celestine
Mineral SrSO4
Also called Celestite
About it
Pale sky-blue crystals much like barite but a little lighter in the hand; its strontium colours a flame crimson. Big geodes come from Madagascar, and fine crystals from Sicily, Ohio, and Michigan.
- Type
- Mineral
- Group
- Sulfate, barite group
- Formula
- SrSO4
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 3.95–3.98
- Streak
- white
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Orthorhombic
- Colours
- pale blue, colourless, white, yellowish, orange
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect basal, good prismatic
Typical values: real specimens vary. For more, see mindat.org.