Homilite
A variety of Minerals
What is Homilite?
Homilite is a borosilicate mineral belonging to the gadolinite group of minerals with formula Ca2(Fe,Mg)B2Si2O10. It occurs as brown monoclinic crystals (space group P21/a) within feldspar masses in pegmatite and was discovered in 1876 in Stoko island, Langesundfiord, Norway. The name is from the Greek for to occur together, in allusion to its association with meliphanite and allanite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Homilite 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.
Quick Facts
Physical Properties
- Color
- Greenish black to brownish black
- Hardness (Mohs)
- 5 - 5.5
- Rock tumbling
- With care
- Density
- 3.34 g/cm³
- Streak
- Grey
Chemical Properties
- Chemical Formula
- Ca2(Fe2+,Mg)B2Si2O10
- Elements
- B, Ca, Fe, Mg, O, Si
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Homilite FAQs
How do I identify Homilite?
Homilite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Greenish black to brownish black color. Look for these key characteristics when examining specimens.
What color is Homilite?
Homilite typically appears in Greenish black to brownish black. Color can vary depending on impurities and formation conditions.
How hard is Homilite?
Homilite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
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