Constituent
Name
Hibonite (CAI Colony)
IMA name
Hibonite
Class
non-silicate mineral
Compound type
oxide-hydroxide
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
$(Ca,Ce)(Al,Ti,Mg)_{12}O_{19}$
Chemical formula
(Ca,Ce)(Al,Ti,Mg)12O19
Elemental formula
(Mg)0.172-2 (Ca)0.942-1 (Al)11.641-12 (Ti)0.165-2 O19 Fe0.063
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mg$ Magnesium element 0.172 - 2 1.0 constituent element main
$Ca$ Calcium element 0.942 - 1 1.0 constituent element main
$Al$ Aluminium element 11.641 - 12 1.0 constituent element main
$Ti$ Titanium element 0.165 - 2 1.0 constituent element main
$O$ Oxygen element 19 1.0 constituent element main
$Fe$ Iron element 0.063 1.0 constituent element replacement
Composition comments
Common impurities: Fe, La, Si
Oxides
Formula $Fe_{2}O_{3}$ $TiO_{2}$ $MgO$ $CaO$ $Al_{2}O_{3}$
Mass fraction (%) 0.75 1.96 1.03 7.87 88.38
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
Molar mass
673.52 $g/mol$
Density
3.84 $g/cm^3$
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.017
Refraction index $n_{\alpha}$
1.807
Refraction index $n_{\beta}$
1.790
Color
Black, Black, Reddish brown
Diaphaneity
opaque
Luster
vitreous