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, yellow 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

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareEudialyte Group family

Carbokentbrooksite

Hardness: 5
Luster: Vitreous
Streak: White
Transparency: Transparent

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, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: yellow.
5
Look at form & habit
Crystal system: trigonal. Typical habit: rhombohedral 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
Density: 3.14 g/cm³
Colors: Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Trigonal
Crystal habit: Rhombohedral crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: In the quartz core of a zoned pegmatite in the Dara-i-Pioz alkaline massif

Where rockhounds find carbokentbrooksite

Classic worldwide localities

Dara-i-Pioz alkaline massif, northern Tajikistan

Field-hunting tip

Where it forms: In the quartz core of a zoned pegmatite in the Dara-i-Pioz alkaline massif. If you start seeing zirsilite-, quartz, microcline in float, you are in the right ground. Typical habit: rhombohedral crystals. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify carbokentbrooksite?+

Mohs hardness is 5. Luster: vitreous. The streak is white. Common colors include yellow.

Where is carbokentbrooksite found?+

Notable localities include Dara-i-Pioz alkaline massif, northern Tajikistan.

Is carbokentbrooksite safe to handle?+

Contains minor radioactive elements; handle with standard mineral safety practices, avoid inhalation of dust, and wash hands after handling.

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 Zirsilite-, Quartz, Microcline, Aegirine, Stillwellite-, Ekanite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does carbokentbrooksite form in?+

Where it forms: In the quartz core of a zoned pegmatite in the Dara-i-Pioz alkaline massif. 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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