IMA Code

Sdr

	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)

Refringence type

biaxial

Refringence sign

unknown

Pure color

colorless

Color

colorless, white

Diaphaneity

transparent to translucent

Luster

vitreous

Links

• Webmineral: Sanderite
• Mindat: Sanderite