Constituent
- Name
- Tschermigite
- IMA name
- Tschermigite
- Class
- non-silicate mineral
- Compound type
- sulfate
- Relevance
- main - major
- Arrangement
- single phase
- Mass
- 0.239 $\pm$ 0.002 $g$
- Mass fraction
- 1.0
- Formula
- $(NH_4)Al(SO_4)_2 \bullet 12(H_2O)$
- Chemical formula
- (NH4)Al(SO4)2•12(H2O)
- Elemental formula
- (N+) H28 Al S2 O16 (O-)4
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $Al_{2}O_{3}$ $H_{2}O$ $SO_{3}$ Mass fraction (%) 11.25 47.69 35.32 - Oxides comments
- N2O5 calculated as (NH4)2O = 5.74%
Strunz
- Class
- sulfates - chromates - molybdates - tungstates (07)
- Division
- sulfates (selenates, etc.) without additional anions, with H2O (07.C)
- Family
- with medium-sized and large cations (07.CC)
- Code
- 07.CC.20
Dana
- Major class
- sulfates, chromates, selenates (VI)
- Class
- hydrated acid and sulfates (29)
- Type
- where AB(XO4)2.x(H2O) (29.05)
- Group
- Alum group (29.05.05)
- Code
- 29.05.05.03
- Phase type
- crystalline
- Crystal system
- isometric (cubic)
- Crystal class
- diploidal
- Crystal class symbol
- m-3 (Th)
- Crystal spacegroup
- Pa-3
- Texture
- monocrystalline
- Molar mass
- 453.33 $g/mol$
- Density
- 1.65 $g/cm^3$
- Refringence type
- isotropic
- Refraction index $n_{\alpha}$
- 1.459
- Color
- white, colorless
- Diaphaneity
- transparent to translucent
- Luster
- vitreous