Ferri-fluoro-leakeite is an exceptionally rare member of the amphibole group, typically identified by its dark, prismatic crystal habit in alkaline igneous complexes. Collectors look for its association with rare-earth minerals in agpaitic pegmatites, where it remains a significant highlight for advanced species-focused mineral cabinets.
Is this ferri-fluoro-leakeite?
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 ferri-fluoro-leakeite with a known reference. Ferri-fluoro-leakeite sits at Mohs 6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Ferri-fluoro-leakeite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferri-fluoro-leakeite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: dark green, black.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often confused with
Ferri-fluoro-leakeite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside ferri-fluoro-leakeite
Minerals reported to co-occur with ferri-fluoro-leakeite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaNa₂(Mg₂Fe³⁺₂Li)Si₈O₂₂F₂
- Mohs hardness
- 6
- Density
- 3.1-3.2 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic Crystals
- Cleavage
- Perfect in Two Directions At 56 and 124 Degrees
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Agpaitic Pegmatites and Alkaline Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find ferri-fluoro-leakeite
Classic worldwide localities
- Verkhne-Espe, Kazakhstan
- Khibiny Massif, Russia
Field-hunting tip
Look in agpaitic pegmatites and alkaline rocks country — that is the host setting where ferri-fluoro-leakeite typically forms. If you start seeing aegirine, microcline, quartz in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify ferri-fluoro-leakeite?+
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