Hydroxylherderite
A variety of Minerals
What is Hydroxylherderite?
Herderite is a phosphate mineral belonging to the apatite, phosphate group, with formula CaBe(PO4)(F,OH). It forms monoclinic crystals, often twinned and variable in colour from colourless through yellow to green. It forms a series with the more common hydroxylherderite, which has more hydroxyl ion than fluoride. It is found in many parts of the world, often in pegmatites and associated with other apatite minerals. It was first described in 1828 for an occurrence in the Sauberg Mine, Erzgebirge, Saxony, Germany. It was named for Saxon mining official Sigmund August Wolfgang von Herder (1776–1838).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hydroxylherderite 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.
Hydroxylherderite Localities Map
See where Hydroxylherderite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colorless, gray, brown, pale yellow, greenish white, light blue, purple; colourless in transmitted light.
- Hardness (Mohs)
- 5 - 5.5
- Density
- 3 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- CaBe(PO4)(OH)
- Elements
- Be, Ca, H, O, P
Also Known As
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Hydroxylherderite FAQs
How do I identify Hydroxylherderite?
Hydroxylherderite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Colorless color. Look for these key characteristics when examining specimens.
What color is Hydroxylherderite?
Hydroxylherderite typically appears in Colorless, gray, brown, pale yellow, greenish white, light blue, purple; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Hydroxylherderite?
Hydroxylherderite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
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