Sinkankasite
A variety of Minerals
What is Sinkankasite?
Sinkankasite, mineral formula: H2MnAl(PO4)2(OH)·6H2O, was named after John Sinkankas (1915–2002), noted author and mineral collector, Scripps Institute of Oceanography. It is triclinic; as colorless, bladed to prismatic crystals up to 4 mm in length, often as divergent, radial aggregates and as pseudomorphs after triphlyte crystals; occurs in the Barker pegmatite (formerly Ferguson pegmatite), east of Keystone, South Dakota, and in the Palermo pegmatite, North Groton, New Hampshire.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Sinkankasite 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
- Colourless
- Hardness (Mohs)
- 4
- Rock tumbling
- Not recommended
Chemical Properties
- Chemical Formula
- Mn2+Al(PO3OH)2(OH) · 6H2O
- Elements
- Al, H, Mn, O, P
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Sinkankasite FAQs
How do I identify Sinkankasite?
Sinkankasite can be identified by its hardness of 4 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Sinkankasite?
Sinkankasite typically appears in Colourless. Color can vary depending on impurities and formation conditions.
How hard is Sinkankasite?
Sinkankasite has a hardness of 4 on the Mohs scale. This gives it moderate hardness.
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