Minyulite
A variety of Minerals
What is Minyulite?
Minyulite is a rare phosphate mineral with a chemical formula of KAl2(OH,F)(PO4)2·4(H2O). It occurs as groups of radiating fine fibrous crystals within rock cracks of phosphatic ironstone. Minyulite belongs to the orthorhombic crystal system. This indicates that it has three axes of unequal length yet all are perpendicular to each other. Its cell constants are a=9.35, b=9.74 c=5.52. As for its optical properties, Minyulite is an anisotropic mineral which means the velocity of light differs when traveling through it depending on the cut of its cross-section which gives it more than one refractive index. The mineral is optically biaxial. Its birefringence value is 0.007. It has three refractive indices which are nα=1.531 nβ=1.534 nγ=1.538. Refractive indices are a ratio of the speed of light in a median with respect to the speed of light passing through the mineral.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Minyulite 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.
Minyulite Localities Map
See where Minyulite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Minyulite
It was first described in 1933 for an occurrence in Western Australia and named after the type locality, Minyulo Well in Western Australia. Minyulite is considered as a secondary phosphate since it is formed by the alteration of a primary phosphate. It occurs in association with dufrenite, apatite, fluellite, wavellite, variscite and leucophosphite. The mineral can be found in the underlying phosphatized rock zone of ornithogenic soil. Minyulite is not found in abundance, it can be found in the seashore of the maritime Arctic.
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Quick Facts
Physical Properties
- Color
- Colourless, white, greenish yellow; colourless in transmitted light.
- Hardness (Mohs)
- 3.5
- Density
- 2.47 g/cm³
Chemical Properties
- Chemical Formula
- KAl2(PO4)2(OH,F) · 4H2O
- Elements
- Al, F, H, K, O, P
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Minyulite FAQs
How do I identify Minyulite?
Minyulite can be identified by its hardness of 3.5 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Minyulite?
Minyulite typically appears in Colourless, white, greenish yellow; colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Minyulite?
Minyulite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.
What is the formation of minyulite of Minyulite?
It was first described in 1933 for an occurrence in Western Australia and named after the type locality, Minyulo Well in Western Australia. Minyulite is considered as a secondary phosphate since it is formed by the alteration of a primary phosphate. It occurs in association with dufrenite, apatite, fluellite, wavellite, variscite and leucophosphite. The mineral can be found in the underlying phosphatized rock zone of ornithogenic soil. Minyulite is not found in abundance, it can be found in the seashore of the maritime Arctic.
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