Oxyplumboroméite is a rare mineral of the roméite group, typically occurring as small, well-formed octahedrons within manganese-rich metamorphic environments. It is characterized by its high specific gravity and distinct cubic morphology, usually found in historically significant manganese mines.
Is this oxyplumboroméite?
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 oxyplumboroméite with a known reference. Oxyplumboroméite sits at Mohs 5-5.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Oxyplumboroméite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Oxyplumboroméite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brown, colorless.
- 5Look at form & habitCrystal system: cubic. Typical habit: octahedral crystals.
Often confused with
Oxyplumboroméite vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside oxyplumboroméite
Minerals reported to co-occur with oxyplumboroméite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Pb₂Sb₂O₆O
- Mohs hardness
- 5-5.5
- Density
- 6.5-7.5 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Cubic
- Crystal habit
- Octahedral Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Metamorphic Manganese Deposits
- Typical price
- $50-500 depending on specimen quality and rarity
Where rockhounds find oxyplumboroméite
Classic worldwide localities
- Långban, Sweden
- Harstigen Mine, Sweden
- Franklin, USA
Field-hunting tip
Look in metamorphic manganese deposits country, the host setting where oxyplumboroméite typically forms. If you start seeing hausmannite, baryte, calcite in float, you are in the right ground. Field specimens usually show a octahedral crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find oxyplumboroméite on the map
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