Bronzite is an iron-rich variety of enstatite known for its distinctive submetallic luster that resembles bronze. Collectors look for its foliated structure and characteristic Schiller effect, which is caused by fine inclusions within the crystal lattice. It is most frequently encountered in basic and ultrabasic igneous environments.
Is this bronzite?
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 bronzite with a known reference. Bronzite sits at Mohs 5.5-6, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: submetallic.
- 4Match the color rangeCompare against the expected color range: brown, bronze, greenish-brown.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: massive, foliated, or prismatic crystals.
Often confused with
Bronzite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Bronzite leaves white, Hypersthene leaves grayish greenish white; luster reads submetallic on Bronzite and vitreous to silky on Hypersthene.
How to tell apart: Luster reads submetallic on Bronzite and vitreous to pearly on cleavages on Enstatite.
Often found alongside bronzite
Minerals reported to co-occur with bronzite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Mg,Fe)₂Si₂O₆
- Mohs hardness
- 5.5-6
- Density
- 3.3-3.4 g/cm³
- Streak
- White
- Luster
- Submetallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Massive, foliated, or prismatic crystals
- Cleavage
- Perfect in two directions at nearly 90 degrees
- Rarity
- Common
- Uses
- Lapidary, Collector, Decorative
- Host rock
- igneous rocks including peridotites, gabbros, and norites
Where rockhounds find bronzite
4 mapped spotsClassic worldwide localities
- Bamble, Norway
- Kurnool, India
- Steinbach, Germany
- Schwarzwald, Germany
- Bushveld, South Africa
Field-hunting tip
Where it forms: igneous rocks including peridotites, gabbros, and norites. If you start seeing labradorite, olivine, chromite in float, you are in the right ground. Typical habit: massive, foliated, or prismatic crystals. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in North Carolina, Alabama, Maryland. Start trip planning there.
Common questions
How do you identify bronzite?+
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Can I find bronzite in the United States?+
What rocks look like bronzite?+
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Find bronzite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
