Mineral phase
- IMA name
- Coquimbite
- Class
- non-silicate mineral
- Compound type
- sulfate
- Formula
- $Fe^{3+}_2(SO_4)_3 \bullet 9(H_2O)$
- Chemical formula
- (Fe3+)2(SO4)3•9(H2O)
- Elemental formula
- (Fe3+)2 S3 O15 (O-)6 H18
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $Fe_{2}O_{3}$ $H_{2}O$ $SO_{3}$ Mass fraction (%) 28.41 28.85 42.74
Strunz
- Class
- sulfates - chromates - molybdates - tungstates (07)
- Division
- sulfates (selenates, etc.) without additional anions, with H2O (07.C)
- Family
- with only medium-sized cations (07.CB)
- Code
- 07.CB.50
Dana
- Major class
- sulfates, chromates, selenates (VI)
- Class
- hydrated acid and sulfates (29)
- Type
- where (A)2(XO4)3.x(H2O) (29.08)
- Group
- -Coquimbite- group (29.08.03)
- Code
- 29.08.03.01
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- ditrigonal-scalenohedral
- Crystal class symbol
- -3m (D3d)
- Crystal spacegroup
- P-31c
- Molar mass
- 562.02 $g/mol$
- Density
- 2 - 2.1 $g/cm^3$
- State NTP
- solid
- Refringence type
- uniaxial
- Refringence sign
- positive
- Birefringence
- 0.007
- Refraction index $n_o$ (w)
- 1.55
- Refraction index $n_e$ (e)
- 1.557
- Color
- greenish white, bluish white, light violet, yellowish white, brownish white
- Diaphaneity
- transparent
- Luster
- vitreous