Amesite
A variety of Minerals
What is Amesite?
Amesite is a mineral with general formula of Mg2Al2SiO5(OH)4. Amesite crystallizes in the triclinic crystal system. It contains three axes of unequal length, not at right angles. It was first described in 1876 for an occurrence in the Chester Emery Mines, Chester, Hampden County, Massachusetts. It was named for mine owner James Ames. It occurs in an environment of low-grade metamorphism affecting rocks with high aluminium and magnesium content. It occurs associated with vesuvianite, chlorite, magnetite, rutile, diaspore, grossular, calcite, diopside and clinozoisite in various locations. Amesite is an uncommon silicate mineral which has been reported from a variety of locations worldwide. Amesite has the first reported natural occurrence of the 6R polytype for a trioctahedral 1:1 layer silicate.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Amesite 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.
Amesite Localities Map
See where Amesite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Originally pale grayish blue-green, also white, colourless, pale green, pink to lilac (chromian)
- Hardness (Mohs)
- 2.5 - 3
- Density
- 2.7 g/cm³
- Streak
- White with very pale green tint
Chemical Properties
- Chemical Formula
- Mg2Al(AlSiO5)(OH)4
- Elements
- Al, H, Mg, O, Si
Also Known As
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Amesite FAQs
How do I identify Amesite?
Amesite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Originally pale grayish blue-green color. Look for these key characteristics when examining specimens.
What color is Amesite?
Amesite typically appears in Originally pale grayish blue-green, also white, colourless, pale green, pink to lilac (chromian). Color can vary depending on impurities and formation conditions.
How hard is Amesite?
Amesite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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