Shigaite
A variety of Wermlandite Group
What is Shigaite?
Shigaite is a rare mineral currently known from just a few localities in the world. It comes in a form of small, hexagonal crystals with sharp edges. It carries the name after the Shiga prefecture in Japan, where it was discovered in 1985. Shigaite is often associated with other minerals and regularly sought by gemstone collectors.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Shigaite 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.
Shigaite Localities Map
See where Shigaite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Composition of Shigaite
Shigaite consists of oxycation sheets of [AlMn2(OH)6] intercalated with oxyanion sheets of [Na(H2O)6{H2O}6(SO4)2]. Linkage between the sheets and within the oxyanion sheet results largely through hydrogen bonding.
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Quick Facts
Physical Properties
- Color
- Deep yellow with black
- Hardness (Mohs)
- 2
- Density
- 2.32 g/cm³
- Streak
- Very pale yellow to white
- Luster
- Vitreous, Dull
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- Mn6Al3(OH)18Na(H2O)62 · 6H2O
- Elements
- Al, H, Mn, Na, O, S
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Shigaite FAQs
How do I identify Shigaite?
Shigaite can be identified by its hardness of 2 on the Mohs scale, Deep yellow with black color, Vitreous, Dull luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Shigaite?
Shigaite typically appears in Deep yellow with black. Color can vary depending on impurities and formation conditions.
How hard is Shigaite?
Shigaite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the composition of shigaite of Shigaite?
Shigaite consists of oxycation sheets of [AlMn2(OH)6] intercalated with oxyanion sheets of [Na(H2O)6{H2O}6(SO4)2]. Linkage between the sheets and within the oxyanion sheet results largely through hydrogen bonding.