Mineral phase
- IMA name
- Geikielite
- Class
- non-silicate mineral
- Compound type
- oxide-hydroxide
- Formula
- $MgTiO_3$
- Chemical formula
- MgTiO3
- Elemental formula
- Mg Ti O3
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $MgO$ $TiO_{2}$ Mass fraction (%) 33.54 66.46
Strunz
- Class
- oxides - hydroxides - arsenites (04)
- Division
- metal:oxygen = 2:3, 3:5, and similar (04.C)
- Family
- with medium-sized cations (04.CB)
- Code
- 04.CB.05
Dana
- Major class
- oxides and hydroxides (III)
- Class
- simple oxides (04)
- Type
- with a cation charge of 3+ (A+++2O3) (04.03)
- Group
- Ilmenite group (04.03.05)
- Code
- 04.03.05.02
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- rhombohedral
- Crystal class symbol
- -3 (S6)
- Crystal spacegroup
- R-3
- Molar mass
- 120.18 $g/mol$
- Density
- 3.79 - 4.2 (calc.: 3.895) $g/cm^3$
- State NTP
- solid
- Refringence type
- uniaxial
- Refringence sign
- negative
- Birefringence
- 0.360 - 0.370
- Refraction index $n_o$ (w)
- 2.31 - 2.35
- Refraction index $n_e$ (e)
- 1.95 - 1.98
- Pure color
- black
- Color
- bluish black, brownish black
- Diaphaneity
- translucent to opaque
- Luster
- submetallic