Juonniite
A variety of Minerals
What is Juonniite?
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 Juonniite 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.
Juonniite Localities Map
See where Juonniite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Hardness (Mohs)
- 4 - 4.5
Chemical Properties
- Chemical Formula
- CaMgSc(PO4)2(OH) · 4H2O
- Elements
- Ca, H, Mg, O, P, Sc
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Juonniite FAQs
How do I identify Juonniite?
Juonniite can be identified by its hardness of 4 - 4.5 on the Mohs scale. Look for these key characteristics when examining specimens.
How hard is Juonniite?
Juonniite has a hardness of 4 - 4.5 on the Mohs scale. This gives it moderate hardness.
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