Mineral phase
IMA name
Tamarugite
Class
non-silicate mineral
Compound type
sulfate
Formula
NaAl(SO4)26(H2O)
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
(SO4)2 Sulfate anion chemical function 2 anionic radical main
H2O Water molecule 6 hydration main
Chemical functions
  Function Number
(SO4)2 2
ROH 2
Chemical bonds
  Bond Number
OH 2
SO1/2 4
Oxides
Formula Na2O Al2O3 H2O SO3
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/cm3
State NTP
solid
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.0130
Refraction index nα
1.484
Refraction index nβ
1.486
Refraction index nγ
1.497
Pure color
colorless
Color
colorless
Diaphaneity
transparent
Luster
vitreous