Constituent
Name
Tamarugite
IMA name
Tamarugite
Class
non-silicate mineral
Compound type
sulfate
Constituent abundance in material
Relevance
main - minor
Arrangement
in multi-phases
Mass fraction
0.06 $\pm$ 0.1
Chemical composition
Formula
$NaAl(SO_4)_2 \bullet 6(H_2O)$
Chemical formula
NaAl(SO4)2•6(H2O)
Elemental formula
(Na+) Al S2 O10 (O-)4 H12
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Na^+$ Sodium cation element 1 constituent cation main
$Al$ Aluminium element 1 constituent element main
$(SO_4)^{2-}$ Sulfate anion chemical function 2 anionic radical main
$H_2O$ Water molecule 6 hydration main
Chemical functions
  Function Number Relevance
$(SO_4)^{2-}$ 2
$R-OH$ 2 main
Chemical bonds
  Bond Number Relevance
$-O-H$ 2 main
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Oxides
Formula $Na_{2}O$ $Al_{2}O_{3}$ $H_{2}O$ $SO_{3}$
Mass fraction (%) 8.85 14.56 30.87 45.73

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.10

Dana

Major class
sulfates, chromates, selenates (VI)
Class
hydrated acid and sulfates (29)
Type
where AB(XO4)2.x(H2O) (29.05)
Group
-Tamarugite- group (29.05.03)
Code
29.05.03.01
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/c
Molar mass
350.19 $g/mol$
Density
2.06 $g/cm^3$
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.0130
Refraction index $n_{\alpha}$
1.484
Refraction index $n_{\beta}$
1.486
Refraction index $n_{\gamma}$
1.497
Color
colorless
Diaphaneity
transparent
Luster
vitreous