Eastonite

A variety of Biotite Group

What is Eastonite?

Market Value Factors

Pricing varies for every rock and mineral, so use these universal factors to gauge Eastonite 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.

Applies to all rocks & minerals.

Eastonite Localities Map

See where Eastonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

Interactive map layers and collecting notes are available in the app.

Quick Facts

Chemical Properties

Chemical Formula
KMg2Al(Al2Si2O10)(OH)2
Elements
Al, H, K, Mg, O, Si
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