Lazulite
Mineral MgAl2(PO4)2(OH)2
About it
Deep blue, wedge-shaped crystals, harder than azurite and with no reaction to acid. Fine crystals come from Rapid Creek in the Yukon and Graves Mountain in Georgia; not to be confused with lazurite.
- Type
- Mineral
- Group
- Phosphate, lazulite group
- Formula
- MgAl2(PO4)2(OH)2
- Hardness (Mohs)
- 5.5–6
- Specific gravity
- 3.08–3.2
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- azure blue, deep blue, sky blue, blue-green
- Transparency
- transparent, translucent, opaque
- Cleavage and fracture
- poor to good prismatic; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.