Chromatite is an extremely rare calcium chromate mineral typically found as yellow crusts in hyper-arid desert environments. It is a highly sought-after rarity for advanced collectors due to its association with unique nitrate-rich evaporite deposits. Due to its chemical composition, it should be stored in a sealed container and handled with significant safety precautions.

Hardness

2.5-3

Mohs

Luster

Resinous

Streak

Yellow

Transparency

Translucent

mineralrare

Chromatite

Hardness: 2.5-3
Luster: Resinous
Streak: Yellow
Transparency: Translucent

Is this chromatite?

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 chromatite with a known reference. Chromatite sits at Mohs 2.5-3 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Chromatite leaves a yellow streak.
3
Read the luster
Hold the specimen under a strong light. Chromatite typically shows a resinous luster.
4
Match the color range
Compare against the expected color range: yellow, yellowish-orange.
5
Look at form & habit
Crystal system: tetragonal. Typical habit: crusts, granular.

Often confused with

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

mineral

Wulfenite

Mohs 3

How to tell apart: Streak differs — Chromatite leaves yellow, Wulfenite leaves white.

How to tell apart: Streak differs — Chromatite leaves yellow, Crocoite leaves orange-yellow; luster reads resinous on Chromatite and adamantine on Crocoite.

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Often found alongside chromatite

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

All properties

Chemical formula: CaCrO₄
Mohs hardness: 2.5-3
Density: 3.51 g/cm³
Colors: Yellow Yellowish-orange
Streak: Yellow
Luster: Resinous
Transparency: Translucent
Crystal system: Tetragonal
Crystal habit: Crusts, Granular
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Arid Evaporite Deposits
Typical price: $50-300 per specimen

Where rockhounds find chromatite

Classic worldwide localities

Atacama Desert, Chile
Bozum, Turkey

Field-hunting tip

Look in arid evaporite deposits country — that is the host setting where chromatite typically forms. If you start seeing nitratine, halite, gypsum in float, you are in the right ground. Field specimens usually show a crusts, granular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify chromatite?+

Mohs hardness is 2.5-3. It typically shows a resinous luster. The streak is yellow. Common colors include yellow, yellowish-orange.

Where is chromatite found?+

Notable localities include Atacama Desert, Chile; Bozum, Turkey.

How much is chromatite worth?+

Typical asking prices fall in the range of $50-300 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is chromatite safe to handle?+

It contains toxic constituents. Chromatite contains hexavalent chromium (Cr6+), which is a known human carcinogen and toxic if ingested, inhaled as dust, or handled with bare skin. Wear gloves and a mask when handling to prevent skin contact and dust inhalation. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like chromatite?+

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

What minerals are found with chromatite?+

Chromatite commonly co-occurs with Nitratine, Halite, Gypsum. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does chromatite form in?+

Chromatite typically forms in arid evaporite deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is chromatite used for?+

Chromatite is used in collector.

Find chromatite on the map

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