Ježekite is an exceptionally rare sodium-lead carbonate mineral known primarily from its type locality at Jachymov. It typically occurs as tiny, tabular, transparent crystals associated with uranyl mineralization in hydrothermal vein environments.

Hardness

3.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Ježekite

Hardness: 3.5
Luster: Vitreous
Streak: White
Transparency: Transparent

No image

Is this ježekite?

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 ježekite with a known reference. Ježekite sits at Mohs 3.5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Ježekite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Ježekite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: white, colorless.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals.

Often confused with

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

mineral

Cerussite

Mohs 3-3.5

How to tell apart: Luster reads vitreous on Ježekite and adamantine on Cerussite.

How to tell apart: Luster reads vitreous on Ježekite and adamantine on Phosgenite.

Compare →

Often found alongside ježekite

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

Quartz
mineral · Mohs 7

All properties

Chemical formula: Na₄Pb₂(CO₃)₃F₂
Mohs hardness: 3.5
Density: 3.31 g/cm³
Colors: White Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal Veins
Typical price: $200-1000+ for rare micro-specimens

Where rockhounds find ježekite

Classic worldwide localities

Jachymov, Czech Republic

Field-hunting tip

Look in hydrothermal veins country, the host setting where ježekite typically forms. If you start seeing uranyl carbonates, quartz in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify ježekite?+

Mohs hardness is 3.5. It typically shows a vitreous luster. The streak is white. Common colors include white, colorless.

Where is ježekite found?+

Notable localities include Jachymov, Czech Republic.

How much is ježekite worth?+

Typical asking prices fall in the range of $200-1000+ for rare micro-specimens. Quality, size, and provenance can move individual specimens well outside that range.

Is ježekite safe to handle?+

It contains toxic constituents. Contains lead, which is a toxic heavy metal; handle with care and wash hands after contact. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like ježekite?+

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

What minerals are found with ježekite?+

Ježekite commonly co-occurs with Uranyl carbonates, Quartz. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does ježekite form in?+

Ježekite typically forms in hydrothermal veins. Working float back to the host body is the standard way to chase a fresh occurrence.

What is ježekite used for?+

Ježekite is used in collector.

Find ježekite on the map

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