Marthozite
A variety of Minerals
What is Marthozite?
Marthozite is an orthorhombic mineral that has a general formula of Cu(UO2)3(SeO3)3(OH)2·7H2O. It was named after Belgian mineralogist Aimé Marthoz (1894-1962), former Director-general of the Union Minière du Haut Katanga - UMHK. It is usually found in cavities in selenian (selenium-containing) digenite. It is specifically found in the zones of oxidation of the Musonoi deposit in Katanga, Africa. Marthozite is orthorhombic, meaning that it has three axes of unequal lengths all orthogonal to each other. Since it is orthorhombic, marthozite is biaxial, meaning that it has three different indices of refraction. Marthozite is anisotropic, which means that it breaks light into one fast ray and one slow ray. Marthozite shows pleochroism from yellowish brown to greenish yellow.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Marthozite 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.
Marthozite Localities Map
See where Marthozite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Chemical Properties
- Chemical Formula
- Cu2+(UO2)3(SeO3)2O2 · 8H2O
- Elements
- Cu, H, O, Se, U
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