Feklichevite is a rare silicate mineral belonging to the eudialyte group, primarily identified in the hyper-alkaline complexes of the Kola Peninsula. Collectors look for its characteristic tabular crystal habit often associated with nepheline syenites and pegmatitic intrusions.
Is this feklichevite?
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 feklichevite with a known reference. Feklichevite sits at Mohs 5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Feklichevite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Feklichevite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brown, reddish-brown.
- 5Look at form & habitCrystal system: trigonal. Typical habit: tabular crystals.
Often confused with
Feklichevite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside feklichevite
Minerals reported to co-occur with feklichevite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₃₀Ca₆(Fe²⁺₃Zr₃Nb)Si₂₄O₇₂(OH)₃·H₂O
- Mohs hardness
- 5
- Density
- 2.8 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Tabular Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Agpaitic Pegmatites and Alkaline Igneous Rocks
- Typical price
- $50-300 per specimen depending on size and quality
Where rockhounds find feklichevite
Classic worldwide localities
- Khibiny Massif, Kola Peninsula, Russia
Field-hunting tip
Look in agpaitic pegmatites and alkaline igneous rocks country — that is the host setting where feklichevite typically forms. If you start seeing aegirine, nepheline, microcline in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find feklichevite on the map
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