Geikielite
A variety of Minerals
What is Geikielite?
Geikielite is a magnesium titanium oxide mineral with formula: MgTiO3. It is a member of the ilmenite group. It crystallizes in the trigonal system forming typically opaque, black to reddish black crystals. It was first described in 1892 for an occurrence in the Ceylonese gem bearing gravel placers. It was named for Scottish geologist Sir Archibald Geikie (1835–1924). It occurs in metamorphosed impure magnesian limestones, in serpentinite derived from ultramafic rocks, in kimberlites and carbonatites. Associated minerals include rutile, spinel, clinohumite, perovskite, diopside, serpentine, forsterite, brucite, hydrotalcite, chlorite and calcite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Geikielite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Geikielite Localities Map
See where Geikielite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- black, red, brownish black
- Hardness (Mohs)
- 5 - 6
- Density
- 3.895 g/cm³
- Streak
- purple brown
Chemical Properties
- Chemical Formula
- MgTiO3
- Elements
- Mg, O, Ti
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Geikielite FAQs
How do I identify Geikielite?
Geikielite can be identified by its hardness of 5 - 6 on the Mohs scale, black color. Look for these key characteristics when examining specimens.
What color is Geikielite?
Geikielite typically appears in black, red, brownish black. Color can vary depending on impurities and formation conditions.
How hard is Geikielite?
Geikielite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
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