Geikielite

Ilmenite Group. Geikielite-Ilmenite Series. The magnesium analogue of Ilmenite, Pyrophanite, and Ecandrewsite. The titanium analogue of Akimotoite. May be confused with Hematite.

History

Activities related to discovery and approval of the group members

Structural context

Geikielite
Crystal System trigonalCrystal Class trigonal pyramidalSpace Group R3
a5.0418—5.0921 (5.0581)
b5.0418—5.0921 (5.0581)
c13.8494—14.0532 (13.9108)
alpha90
beta90
gamma120
volume304.883—315.573 (308.234)

Based on 6 measurements

Chemical context

Stoichiometric formulas

Geikielite
mindat.org
  • March 13, 2023MgTiO3
IMA
  • March 13, 2023MgTiO3
mineralogy.rocks
  • Aug. 30, 2022MgTi4+O3

Elements recorded on EPMA

5
Mg
5
O
5
Ti
2
Ni
1
Mn
1
Zn

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • brownish black
    Color noteOriginal color note from the source
    Black, red, brownish black
    StreakStreak entities, recognized using a custom trained NER model
    • purple brown
    Streak noteOriginal streak note from the source
    Purple brown
    Lustre
    Sub-Metallic
    Fracture
    Conchoidal
    Sub-Conchoidal
    Transparency
    Translucent
    Opaque
    Hardness
    5—6
    Measured density
    3.79—4.2
    Calculated density
    3.895