Thomasclarkite
A variety of Minerals
What is Thomasclarkite?
Thomasclarkite-(Y) is a rare mineral which was known as UK-93 until 1997, when it was renamed in honour of Thomas H. Clark (1893–1996), McGill University professor. The mineral is one of many rare-earth element minerals from Mont Saint-Hilaire. The only reported occurrence is in an alkalic pegmatite dike in an intrusive gabbro-nepheline syenite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Thomasclarkite 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.
Thomasclarkite Localities Map
See where Thomasclarkite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
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