Constituent
Name
Berlinite
IMA name
Berlinite
Class
non-silicate mineral
Compound type
phosphate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
$Al(PO_4)$
Chemical formula
AlPO4
Elemental formula
Al P O4
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Al$ Aluminium element 1 constituent element main
$(PO_4)^{3-}$ Phosphate anion chemical function 1 anionic radical main
Chemical functions
  Function Number
$(PO_4)^{3-}$ 1
Chemical bonds
  Bond Number
$\dddot - \dddot - \dddot - P \dddot - O^{-3/4}$ 4
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
Texture
monocrystalline
Molar mass
121.95 $g/mol$
Density
2.64 $g/cm^3$
Refringence type
uniaxial
Refringence sign
positive
Birefringence
0.0055
Refraction index $n_{\alpha}$
1.5235
Refraction index $n_{\beta}$
1.529
Color
colorless, gray, gray pink, light pink
Diaphaneity
transparent to subtranslucent
Luster
vitreous