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, 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?+
Where is ferrokentbrooksite found?+
How much is ferrokentbrooksite worth?+
What rocks look like ferrokentbrooksite?+
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Find ferrokentbrooksite on the map
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