Lópezite
A variety of Minerals
What is Lópezite?
Lopezite is a rare red chromate mineral with chemical formula: K2Cr2O7. It crystallizes in the triclinic crystal system. It occurs as rare vug fillings in nitrate ores in association with tarapacáite (K2CrO4), dietzeite and ulexite in the Chilean Atacama and is reported from the Bushveld igneous complex of South Africa. Lopezite was first described in 1937 for an occurrence in Iquique Province, Chile and named after Chilean mining engineer Emiliano López Saa (1871–1959). Most lopezite offered for sale to collectors is artificially produced. Synthetic varieties also exhibit monoclinic crystals.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Lópezite 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.
Lópezite Localities Map
See where Lópezite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Orange-red, red
- Hardness (Mohs)
- 2.5
- Density
- 2.704 g/cm³
- Streak
- light yellow
Chemical Properties
- Chemical Formula
- K2Cr6+2O7
- Elements
- Cr, K, O
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Lópezite FAQs
How do I identify Lópezite?
Lópezite can be identified by its hardness of 2.5 on the Mohs scale, Orange-red color. Look for these key characteristics when examining specimens.
What color is Lópezite?
Lópezite typically appears in Orange-red, red. Color can vary depending on impurities and formation conditions.
How hard is Lópezite?
Lópezite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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