Overite
A variety of Minerals
What is Overite?
Segelerite is a complex phosphate mineral with formula CaMgFeOH(PO4)2·H2O. It occurs in pegmatites and forms striking green or chartreuse crystals. It was discovered in 1974 in the Black Hills of South Dakota by an amateur mineralogist from New York, Curt G. Segeler (1901–1989), after whom it is named. It is closely related to overite which is virtually the same mineral except that the iron is replaced by aluminium. Another mineral in the same series is juonniite wherein the iron is also replaced, this time by scandium.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Overite 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
- Light apple-green to colourless; colourless in transmitted light.
- Hardness (Mohs)
- 3.5 - 4
- Rock tumbling
- Not recommended
- Density
- 2.51 g/cm³
Chemical Properties
- Chemical Formula
- CaMgAl(PO4)2(OH) · 4H2O
- Elements
- Al, Ca, H, Mg, O, P
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Overite FAQs
How do I identify Overite?
Overite can be identified by its hardness of 3.5 - 4 on the Mohs scale, Light apple-green to colourless; colourless in transmitted light. color. Look for these key characteristics when examining specimens.
What color is Overite?
Overite typically appears in Light apple-green to colourless; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Overite?
Overite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.
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