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, so Chromatite leaves yellow, Wulfenite leaves white.

How to tell apart: Streak differs, so 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, 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.