Carbonatite is a rare igneous rock composed of more than 50% carbonate minerals rather than the typical silicate minerals found in most igneous rocks. They are of significant interest to collectors and geologists because they are the world's primary source of rare earth elements, niobium, and apatite.

Hardness

3-4

Mohs

Luster

Vitreous to Dull

Streak

White

Transparency

Opaque

igneousrare

Carbonatite

Hardness: 3-4
Luster: Vitreous to Dull
Streak: White
Transparency: Opaque

Is this carbonatite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch carbonatite with a known reference. Carbonatite sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Carbonatite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Carbonatite typically shows a vitreous to dull luster.
4
Match the color range
Compare against the expected color range: white, gray, tan, pink, brown.
5
Look at form & habit
Typical habit: massive to granular.

Often confused with

Carbonatite vs. its common look-alikes — and how to tell them apart in the field.

metamorphic

Marble

Mohs 3-4

How to tell apart: Luster reads vitreous to dull on Carbonatite and subvitreous on Marble.

How to tell apart: Luster reads vitreous to dull on Carbonatite and dull to earthy on Limestone.

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Often found alongside carbonatite

Minerals reported to co-occur with carbonatite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Mohs hardness: 3-4
Density: 2.7-3.0 g/cm³
Colors: White Gray Tan Pink Brown
Streak: White
Luster: Vitreous to Dull
Transparency: Opaque
Crystal habit: Massive to Granular
Rarity: Rare
Uses: Industrial, Scientific Research
Host rock: Intrusive Igneous Complexes
Typical price: $10-100 per specimen

Where rockhounds find carbonatite

Classic worldwide localities

Fen Complex, Norway
Kola Peninsula, Russia
Mount Weld, Australia
Palabora, South Africa
Mountain Pass, USA

Field-hunting tip

Look in intrusive igneous complexes country — that is the host setting where carbonatite typically forms. If you start seeing calcite, dolomite, apatite in float, you are in the right ground. Field specimens usually show a massive to granular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify carbonatite?+

Mohs hardness is 3-4. It typically shows a vitreous to dull luster. The streak is white. Common colors include white, gray, tan, pink.

Where is carbonatite found?+

Notable localities include Fen Complex, Norway; Kola Peninsula, Russia; Mount Weld, Australia; Palabora, South Africa; Mountain Pass, USA.

How much is carbonatite worth?+

Typical asking prices fall in the range of $10-100 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like carbonatite?+

Carbonatite is most often confused with Marble, Limestone. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with carbonatite?+

Carbonatite commonly co-occurs with calcite, dolomite, apatite, magnetite, phlogopite, pyrochlore. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does carbonatite form in?+

Carbonatite typically forms in intrusive igneous complexes. Working float back to the host body is the standard way to chase a fresh occurrence.

What is carbonatite used for?+

Carbonatite is used in industrial, scientific research.

Find carbonatite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.