Mineral phase
IMA name
Sanderite
IMA Code
Sdr
Type
Class
non-silicate mineral
Compound type
sulfate
Chemical composition
Formula
$MgSO_4 \bullet 2H_2O$
Chemical formula
MgSO4•2H2O
Elemental formula
(Mg2+) S O4 (O-)2 H4
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mg^{2+}$ Magnesium(II) cation element 1 constituent cation main
$(SO_4)^{2-}$ Sulfate anion chemical function 1 anionic radical main
$H_2O$ Water molecule 2 hydration main
Chemical functions
  Function Number
$(SO_4)^{2-}$ 1
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Mg^{2+} \cdot O^{-}-$ 2
$-O \dots H-$ 4
$-O-H$ 2
$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$ 4
Oxides
Formula $MgO$ $SO_{3}$ $H_{2}O$
Mass fraction (%) 25.77 51.19 23.04

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.07

Dana

Major class
sulfates, chromates, selenates (VI)
Class
hydrated acid and sulfates (29)
Type
where AXO4.x(H2O) (29.06)
Group
-Sanderite- group (Dihydrates, orthorhombic) (29.06.04)
Code
29.06.04.01
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
disphenoidal
Crystal class symbol
222 (D2)
Crystal spacegroup
P2(1)2(1)2(1)
Molar mass
156.40 $g/mol$
Density
2.37 $g/cm^3$
State NTP
solid
Refringence type
biaxial
Refringence sign
unknown
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent to translucent
Luster
vitreous
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