Mineral Information and Data:

Ilmenite
Fe2+Ti4+O3 [CNMNC approved formula]

Named for the early-noted occurrence in the Il’men Mountains, Russia.

IMA status : Valid species (Pre-IMA 1827) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
04.03.05.01  
  (04) Simple Oxides
  (04.03) with a cation charge of 3+ (A+++2 O3)
  (04.03.05) Ilmenite Group
  
Nickel-Strunz
(10th edition) :
04.CB.05
  (04) Oxides and Hydroxides
  (04.C) Metal:Oxygen = 2:3, 3:5, and Similar
  (04.CB) With medium-sized cations
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
Unit cell: a = 5.09 Ǻ, c = 14.09 Ǻ
Crystal Habit: Crystals thick tabular or acute rhombohedral; granular; massive, lamellar to compact
Twinning: On {0001}, Simple; on {10-11}, lamellar
  
Color: Iron-black
Diaphaneity: Opaque
Luster: Metallic, Sub-Metallic
Hardness (Mohs): 5 to 6
Measured Density: 4.72 g/cm3
Cleavage: 2; {0001} and {10-11} parting
Tenacity: Brittle
Fracture: Conchoidal to sub-conchoidal
Streak: Black to reddish brown
  
Polymorphism and Series: Forms three series, with ecandrewsite, with geikielite, and with
pyrophanite.
Geologic Setting: A common accessory mineral disseminated in igneous rocks, as granites, gabbros, and kimberlites; in granite pegmatites, carbonatites, and high-grade metamorphic rocks; may attain economic concentration in layered mafic intrusions and in “black sand” placer deposits.
Mineral Association: Magnetite, hematite, rutile, ulvöspinel, pyrrhotite, apatite
  
Synonyms/varieties: Axotomous Eisenerz, Cibdelophane, Haplotypite, Titanic Iron
Other Properties: Paramagnetic (weakly attracted to magnetic fields). BioMineral.

 

Ilmenite
Ilmenite on dolomite
Origin: Egginerjoch, Saas Fee, Switzerland
Picture height: crystal 2 mm
Sample owner: W.J. Lustenhouwer
Photo: Pieter Stemvers, Leusden, Netherlands

 

Ilmenite
Origin: Mont St, Hilaire, Quebec, Canada
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Ilmenite
Ilmenite with quartz
Origin: Carizzo Mts., Hudspeth Co., Texas, U.S.A.
Sample size: 5.5 x 5.6 x 4.5 cm
Photo: Dan Weinrich

 

Ilmenite
Ilmenite with albite
Origin: Baghicha, Gilgit-Skardu Road, Northern Areas, Pakistan
Sample size: 7 x 4.5 x 3.3 cm
Photo: Dan Weinrich

 

Ilmenite
(zoom-in of above)

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