Ferrokentbrooksite is a rare member of the eudialyte group characterized by its iron-dominant composition. It is primarily found in hyper-alkaline intrusive complexes, typically appearing as red to brownish-red grains or small tabular crystals embedded in silicate rocks.
Is this ferrokentbrooksite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch ferrokentbrooksite with a known reference. Ferrokentbrooksite sits at Mohs 5-6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Ferrokentbrooksite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferrokentbrooksite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: red, brownish-red, pink.
- 5Look at form & habitCrystal system: trigonal. Typical habit: tabular crystals, massive, granular.
Often confused with
Ferrokentbrooksite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside ferrokentbrooksite
Minerals reported to co-occur with ferrokentbrooksite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₁₅Ca₆(Fe²⁺,Mn)₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,F,OH)₂
- Mohs hardness
- 5-6
- Density
- 3.1-3.2 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Tabular Crystals, Massive, Granular
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Alkaline Igneous Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find ferrokentbrooksite
Classic worldwide localities
- Mont Saint-Hilaire, Quebec, Canada
- Lovozero Massif, Kola Peninsula, Russia
Field-hunting tip
Look in alkaline igneous rocks country — that is the host setting where ferrokentbrooksite typically forms. If you start seeing aegirine, microcline, nepheline in float, you are in the right ground. Field specimens usually show a tabular crystals, massive, granular habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify ferrokentbrooksite?+
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How much is ferrokentbrooksite worth?+
What rocks look like ferrokentbrooksite?+
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Find ferrokentbrooksite on the map
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