Constituent
Name
Struvite
IMA name
Struvite
Class
non-silicate mineral
Compound type
phosphate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass
0.14 $\pm$ 0.002 $g$
Mass fraction
1.0
Chemical composition
Formula
$(NH_4)MgPO_4 \bullet 6(H_2O)$
Chemical formula
(NH4)MgPO4•6(H2O)
Elemental formula
(N+) H16 (Mg2+) P O7 (O-)3
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$NH_4^+$ Ammonium ion molecule 1 molecular ion main
$Mg^{2+}$ Magnesium(II) cation element 1 constituent cation main
$(PO_4)^{3-}$ Phosphate anion chemical function 1 anionic radical main
$H_2O$ Water molecule 6 hydration main
Chemical functions
  Function Number Relevance
$(PO_4)^{3-}$ 1
$R-OH$ 2 main
Chemical bonds
  Bond Number Relevance
$\geq N^+-H$ 4 main
$-O-H$ 2 main
$\dddot - \dddot - \dddot - P \dddot - O^{-3/4}$ 4
Oxides
Formula $MgO$ $P_{2}O_{5}$ $H_{2}O$
Mass fraction (%) 16.42 28.92 44.05
Oxides comments
N2O5 calculated as (NH4)2O = 10.61%

Strunz

Class
phosphates - arsenates - vanadates (08)
Division
phosphates without additional anions, with H2O (08.C)
Family
with large and medium-sized cations, RO4:H2O < 1:1 (08.CH)
Code
08.CH.40

Dana

Major class
phosphates, arsenates, vanadates (VII)
Class
hydrated phosphates (40)
Type
where A++ B++ (XO4)·x(H2O) (40.01)
Group
Struvite group (40.01.01)
Code
40.01.01.01
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
pyramidal
Crystal class symbol
mm2 (C2v)
Crystal spacegroup
Pmn2(1)
Texture
monocrystalline
Molar mass
245.41 $g/mol$
Density
1.7 $g/cm^3$
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.0090
Refraction index $n_{\alpha}$
1.495
Refraction index $n_{\beta}$
1.496
Refraction index $n_{\gamma}$
1.504
Dispersion V
relatively weak
Color
white, yellowish white, brownish white
Diaphaneity
transparent to translucent
Luster
vitreous