Rhodonite nodules are typically encountered as smooth, rounded masses often featuring striking black manganese oxide veining or dendritic patterns. They are prized by lapidary enthusiasts for their durability and the beautiful contrast between the vivid pink-red rhodonite and dark matrix. These nodules are primarily found in metamorphic environments associated with manganese-rich sedimentary rocks.
Is this rhodonite nodules?
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 rhodonite nodules with a known reference. Rhodonite Nodules sits at Mohs 5.5-6.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Rhodonite Nodules leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Rhodonite Nodules typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: pink, red, brown, black.
- 5Look at form & habitCrystal system: triclinic. Typical habit: massive, granular, nodular.
Often confused with
Rhodonite Nodules vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside rhodonite nodules
Minerals reported to co-occur with rhodonite nodules. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Mn,Fe,Mg,Ca)SiO₃
- Mohs hardness
- 5.5-6.5
- Density
- 3.4-3.7 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Massive, Granular, Nodular
- Cleavage
- Perfect Prismatic
- Rarity
- Common
- Uses
- Lapidary, Collector, Ornamental
- Host rock
- Metamorphic Manganese-rich Deposits
- Typical price
- $5-50 for small nodules or cabs, $100+ for high-quality specimens
Where rockhounds find rhodonite nodules
1 mapped spotsClassic worldwide localities
- Russia
- Sweden
- Australia
- USA
- Brazil
Field-hunting tip
Look in metamorphic manganese-rich deposits country — that is the host setting where rhodonite nodules typically forms. If you start seeing manganese oxides, quartz, garnet in float, you are in the right ground. Field specimens usually show a massive, granular, nodular habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in California — start trip planning there.
Common questions
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Find rhodonite nodules on the map
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