Mineral phase
- IMA name
- Berlinite
- Class
- non-silicate mineral
- Compound type
- phosphate
- Formula
- $Al(PO_4)$
- Chemical formula
- AlPO4
- Elemental formula
- Al P O (O-)3
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $Al_{2}O_{3}$ $P_{2}O_{5}$ Mass fraction (%) 41.8 58.2
Strunz
- Class
- phosphates - arsenates - vanadates (08)
- Division
- phosphates, etc. without additional anions, without H2O (08.A)
- Family
- with small cations (some also with larger ones) (08.AA)
- Code
- 08.AA.05
Dana
- Major class
- phosphates, arsenates, vanadates (VII)
- Class
- anhydrous phosphates (38)
- Type
- A+ XO4 (38.04)
- Group
- Berlinite group (38.04.02)
- Code
- 38.04.02.01
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- trapezohedral
- Crystal class symbol
- 32 (D3)
- Crystal spacegroup
- P3(1)21
- Molar mass
- 121.95 $g/mol$
- Density
- 2.64 $g/cm^3$
- State NTP
- solid
- Refringence type
- uniaxial
- Refringence sign
- positive
- Birefringence
- 0.0055
- Refraction index $n_o$ (w)
- 1.5235
- Refraction index $n_e$ (e)
- 1.529
- Pure color
- colorless
- Color
- colorless, gray, gray pink, light pink
- Diaphaneity
- transparent to subtranslucent
- Luster
- vitreous