Carbokentbrooksite is a rare member of the eudialyte group primarily known from the alkaline igneous complex at Mont Saint-Hilaire. It typically occurs as small, dark brown equant crystals embedded in syenite pegmatites. Identification usually requires professional analysis due to its striking chemical similarity to other complex silicates in the eudialyte group.

Hardness

5-6

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralrareEudialyte Group family

Carbokentbrooksite

Hardness: 5-6
Luster: Vitreous
Streak: White
Transparency: Translucent

No image

Is this carbokentbrooksite?

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 carbokentbrooksite with a known reference. Carbokentbrooksite sits at Mohs 5-6 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Carbokentbrooksite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Carbokentbrooksite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: dark brown, reddish-brown.
5
Look at form & habit
Crystal system: trigonal. Typical habit: equant to tabular crystals.

Often confused with

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

Often found alongside carbokentbrooksite

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

All properties

Chemical formula: (Na,◻)₁₂(Na,Ce)₆Ca₆Mn₃Zr₃NbSi₂₅O₇₃(CO₃,OH)₃(H₂O)
Mohs hardness: 5-6
Density: 2.98 g/cm³
Colors: Dark Brown Reddish-brown
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Trigonal
Crystal habit: Equant to Tabular Crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Rocks
Typical price: $50-300 per specimen

Where rockhounds find carbokentbrooksite

Classic worldwide localities

Mont Saint-Hilaire, Quebec, Canada

Field-hunting tip

Look in alkaline igneous rocks country — that is the host setting where carbokentbrooksite typically forms. If you start seeing aegirine, microcline, arfvedsonite in float, you are in the right ground. Field specimens usually show a equant to tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify carbokentbrooksite?+

Mohs hardness is 5-6. It typically shows a vitreous luster. The streak is white. Common colors include dark brown, reddish-brown.

Where is carbokentbrooksite found?+

Notable localities include Mont Saint-Hilaire, Quebec, Canada.

How much is carbokentbrooksite 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 carbokentbrooksite safe to handle?+

This mineral is radioactive. Contains minor radioactive elements; handle with standard mineral safety practices, avoid inhalation of dust, and wash hands after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like carbokentbrooksite?+

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

What minerals are found with carbokentbrooksite?+

Carbokentbrooksite commonly co-occurs with Aegirine, Microcline, Arfvedsonite, Nepheline, Sodalite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does carbokentbrooksite form in?+

Carbokentbrooksite typically forms in alkaline igneous rocks. Working float back to the host body is the standard way to chase a fresh occurrence.

What is carbokentbrooksite used for?+

Carbokentbrooksite is used in collector.

Find carbokentbrooksite on the map

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