Augelite
Mineral Al2(PO4)(OH)3
About it
Clear to pink tabular crystals, glassy and fairly hard for a phosphate. The best come from the tin mines of Bolivia; also known from White Mountain in California.
- Type
- Mineral
- Group
- Phosphate
- Formula
- Al2(PO4)(OH)3
- Hardness (Mohs)
- 4.5–5
- Specific gravity
- 2.69–2.71
- Streak
- white
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Monoclinic
- Colours
- colourless, white, pale yellow, pink, pale blue
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction, good in another
Typical values: real specimens vary. For more, see mindat.org.