Miguelromeroite is a rare manganese arsenate mineral found in the oxidized zones of ore deposits. It typically forms small, transparent yellow or orange crystals and is highly prized by micromounters and advanced mineral collectors.
Is this miguelromeroite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch miguelromeroite with a known reference. Miguelromeroite sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Miguelromeroite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Miguelromeroite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, yellowish-orange.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: equant to short prismatic crystals, often as crusts.
Often confused with
Miguelromeroite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside miguelromeroite
Minerals reported to co-occur with miguelromeroite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mn₅(AsO₃OH)₂(AsO₄)₂·10H₂O
- Mohs hardness
- 3-4
- Density
- 3.37 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Equant to Short Prismatic Crystals, Often as Crusts
- Cleavage
- Perfect On {100}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Hydrothermal Zones in Mineral Deposits
- Typical price
- $50-500 depending on specimen quality and size
Where rockhounds find miguelromeroite
Classic worldwide localities
- Mapimi, Durango, Mexico
Field-hunting tip
Look in oxidized hydrothermal zones in mineral deposits country — that is the host setting where miguelromeroite typically forms. If you start seeing adamite, conichalcite, aragonite in float, you are in the right ground. Field specimens usually show a equant to short prismatic crystals, often as crusts habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify miguelromeroite?+
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Find miguelromeroite on the map
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