Class

non-silicate mineral

Compound type

sulfate

Chemical functions

	Function	Number
	$(SO_4)^{2-}$	1

Chemical bonds

	Bond	Number
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4

Oxides

Formula	$BaO$	$SO_{3}$
Mass fraction (%)	67.7	34.3

Strunz

Class

sulfates - chromates - molybdates - tungstates (07)

Division

sulfates (selenates, etc.) without additional anions, without H2O (07.A)

Family

with only large cations (07.AD)

Code

07.AD.35

Dana

Major class

sulfates, chromates, selenates (VI)

Class

anhydrous acid and sulfates (28)

Type

where (A++)XO4 (28.03)

Group

Barite group (28.03.01)

Code

28.03.01.01

Phase type

crystalline

Crystal system

orthorhombic

Crystal class

dipyramidal

Crystal class symbol

mmm (D2h)

Crystal spacegroup

Pnma

Molar mass

233.39 $g/mol$

Density

4.48 $g/cm^3$

Refringence type

biaxial

Refringence sign

positive

Birefringence

0.011 - 0.012

Refraction index $n_{\alpha}$

1.634 - 1.637

Refraction index $n_{\beta}$

1.6355 - 1.638

Refraction index $n_{\gamma}$

1.646 - 1.648

Dispersion V

36 - 42

Color

white, yellowish white, grayish white, brownish white, dark brown

Diaphaneity

transparent to opaque

Luster

vitreous