Čejkaite is an extremely rare secondary uranium carbonate mineral found primarily in the Jachymov mining district. It typically forms thin tabular crystals or delicate crusts and is identified by its association with other secondary uranium minerals in oxidized zones.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareCarbonate Mineral family

Čejkaite

Hardness: 2
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this čejkaite?

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 čejkaite with a known reference. Čejkaite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Čejkaite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Čejkaite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white, pale yellow.
5
Look at form & habit
Crystal system: triclinic. Typical habit: tabular crystals, crusts, radial aggregates.

Often confused with

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

How to tell apart: Streak differs — Čejkaite leaves white, Liebigite leaves pale yellow.

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Often found alongside čejkaite

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

All properties

Chemical formula: Na₄(UO₂)(CO₃)₃
Mohs hardness: 2
Density: 2.44 g/cm³
Colors: Colorless White Pale Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Triclinic
Crystal habit: Tabular Crystals, Crusts, Radial Aggregates
Cleavage: Good On {001}
Rarity: Rare
Uses: Collector
Host rock: Oxidized Uranium-rich Hydrothermal Deposits
Typical price: $50-300 per specimen

Where rockhounds find čejkaite

Classic worldwide localities

Jachymov, Czech Republic

Field-hunting tip

Look in oxidized uranium-rich hydrothermal deposits country — that is the host setting where čejkaite typically forms. If you start seeing uraninite, schröckingerite, metakahlerite in float, you are in the right ground. Field specimens usually show a tabular crystals, crusts, radial aggregates habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify čejkaite?+

Mohs hardness is 2. It typically shows a vitreous luster. The streak is white. Common colors include colorless, white, pale yellow.

Where is čejkaite found?+

Notable localities include Jachymov, Czech Republic.

How much is čejkaite 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 čejkaite safe to handle?+

This mineral is radioactive. Contains uranium; store away from other minerals, handle with gloves, and wash hands thoroughly after contact. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like čejkaite?+

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

What minerals are found with čejkaite?+

Čejkaite commonly co-occurs with Uraninite, Schröckingerite, Metakahlerite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does čejkaite form in?+

Čejkaite typically forms in oxidized uranium-rich hydrothermal deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is čejkaite used for?+

Čejkaite is used in collector.

Find čejkaite on the map

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