Herderite
A variety of Herderite Subgroup
What is Herderite?
Herderite is a phosphate mineral rarely found pure. It is commonly associated with other minerals. The crystal is too soft to be used with jewelry, but gem-quality specimens are highly sought by collectors. Large specimens are particularly rare and prized even more.
Etymology & Origins
It was named for Saxon mining official Sigmund August Wolfgang von Herder (1776–1838).
Uses & Applications
Herderite is used to produce industrial fertilizers, and can also be incorporated as a part of rust-control agents and processes. Its color and shape are pleasing enough that some people like to collect it for décor.
Optical Properties
- Refractive Index
- 1.587-1.642
- Birefringence
- 0.028-0.032
- Optical Character
- Biaxial positive or negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Herderite 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.
Herderite Localities Map
See where Herderite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
The Meaning
Herderite is a birthstone for the zodiac sign of Aries.
Quick Facts
Physical Properties
- Color
- Colourless, pale yellow, greenish-white; colourless in transmitted light
- Hardness (Mohs)
- 5 - 5.5
- Density
- 3.02 g/cm³
- Streak
- White
- Luster
- Vitreous, Sub-vitreous
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- CaBe(PO4)F
- Elements
- Be, Ca, F, O, P
Also Known As
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Herderite FAQs
How do I identify Herderite?
Herderite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Colourless color, Vitreous, Sub-vitreous luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Herderite?
Herderite typically appears in Colourless, pale yellow, greenish-white; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Herderite?
Herderite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.