Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca$	Calcium	element	0 - 1		constituent element	main
	$Ce$	Cerium	element	0 - 1		constituent element	main
	$Al$	Aluminium	element	10 - 12		constituent element	main
	$Ti$	Titanium	element	0 - 2		constituent element	main
	$Mg$	Magnesium	element	0 - 2		constituent element	main
	$O$	Oxygen	element	19		constituent element	main

Composition comments

Common impurities: Fe, La, Si

Oxides

Formula	$CaO$	$La_{2}O_{3}$	$Ce_{2}O_{3}$	$MgO$	$TiO_{2}$	$Al_{2}O_{3}$	$FeO$
Mass fraction (%)	6.33	2.3	2.32	0.28	5.63	74.8	7.1

Oxides comments

Oxides proportion for Ca_{0.8}Ce_{0.1}La_{0.1}Al_{10.4}Ti_{0.5}Fe^{2+}_{0.7}Mg_{0.05}O_{19}

Strunz

Class

oxides - hydroxides - arsenites (04)

Division

metal:oxygen = 2:3, 3:5, and similar (04.C)

Family

with large and medium-sized cations (04.CC)

Code

04.CC.45

Dana

Major class

oxides and hydroxides (III)

Class

multiple oxides (07)

Type

with O19 groups (07.04)

Group

Hexagonal (P63/mmc) (07.04.01)

Code

07.04.01.01

Phase type

crystalline

Crystal system

hexagonal

Crystal class

dihexagonal-dipyramidal

Crystal class symbol

6/mmm (D6h)

Crystal spacegroup

P6(3)/mmc

Refringence type

uniaxial

Refringence sign

negative

Birefringence

0.017

Refraction index $n_o$ (w)

1.807

Refraction index $n_e$ (e)

1.790

Pure color

brown

Color

Black, Black, Reddish brown

Diaphaneity

opaque

Luster

vitreous

Links

• Webmineral database
• Wikipedia
• Mindat
• Handbook of Mineralogy (Min. Soc. Am)