Brenkite is an exceptionally rare calcium fluoride carbonate mineral found in hydrothermal deposits. Collectors typically search for small, clear tabular crystals, often associated with fluorite and calcite in alpine-type veins.

Hardness

3.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Brenkite

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

Is this brenkite?

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 brenkite with a known reference. Brenkite 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. Brenkite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Brenkite 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: orthorhombic. Typical habit: tabular crystals, granular masses.

Often confused with

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

Often found alongside brenkite

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

All properties

Chemical formula: Ca₂F₂CO₃
Mohs hardness: 3.5
Density: 3.2 g/cm³
Colors: Colorless White Pale Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Orthorhombic
Crystal habit: Tabular Crystals, Granular Masses
Cleavage: Distinct On {001}
Rarity: Rare
Uses: Collector
Host rock: Hydrothermal Veins
Typical price: $50-300 per specimen

Where rockhounds find brenkite

Classic worldwide localities

Brennberg, Austria
Kola Peninsula, Russia

Field-hunting tip

Look in hydrothermal veins country — that is the host setting where brenkite typically forms. If you start seeing fluorite, calcite, ankerite in float, you are in the right ground. Field specimens usually show a tabular crystals, granular masses habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify brenkite?+

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

Where is brenkite found?+

Notable localities include Brennberg, Austria; Kola Peninsula, Russia.

How much is brenkite 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.

What rocks look like brenkite?+

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

What minerals are found with brenkite?+

Brenkite commonly co-occurs with Fluorite, Calcite, Ankerite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does brenkite form in?+

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

What is brenkite used for?+

Brenkite is used in collector.

Find brenkite on the map

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