Biotite Group
A variety of Trioctahedral micas Group
What is Biotite Group?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Biotite Group 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.
Quick Facts
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