Montroydite
A variety of Minerals
What is Montroydite?
Montroydite is the mineral form of mercury(II) oxide with formula HgO. It is a rare mercury mineral. It was first described for an occurrence in the mercury deposit at Terlingua, Texas and named for Montroyd Sharp who was an owner of the deposit. Montroydite occurs in mercury deposits of hydrothermal origin. Associated minerals include: native mercury, cinnabar, metacinnabar, calomel, eglestonite, terlinguaite, mosesite, kleinite, edgarbaileyite, gypsum, calcite and dolomite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Montroydite 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.
Montroydite Localities Map
See where Montroydite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Deep red, brownish red to brown; Orange-red to pale yellow in transmitted light, with decreasing thickness
- Hardness (Mohs)
- 1.5 - 2
- Density
- 11.22 g/cm³
- Streak
- Yellow-brown
Chemical Properties
- Chemical Formula
- HgO
- Elements
- Hg, O
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Montroydite FAQs
How do I identify Montroydite?
Montroydite can be identified by its hardness of 1.5 - 2 on the Mohs scale, Deep red color. Look for these key characteristics when examining specimens.
What color is Montroydite?
Montroydite typically appears in Deep red, brownish red to brown; Orange-red to pale yellow in transmitted light, with decreasing thickness. Color can vary depending on impurities and formation conditions.
How hard is Montroydite?
Montroydite has a hardness of 1.5 - 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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