Ferro-ferri-fluoro-leakeite is a rare member of the amphibole supergroup characterized by its complex chemical composition. Collectors typically find it as dark, prismatic crystals embedded within alkaline igneous rocks such as syenites. Identification usually requires micro-analysis due to its visual similarity to other common dark-colored sodic amphiboles.
Is this ferro-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 ferro-ferri-fluoro-leakeite with a known reference. Ferro-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. Ferro-ferri-fluoro-leakeite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferro-ferri-fluoro-leakeite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: dark blue, black.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often confused with
Ferro-ferri-fluoro-leakeite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside ferro-ferri-fluoro-leakeite
Minerals reported to co-occur with ferro-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(Fe²⁺₂Fe³⁺₂Li)Si₈O₂₂F₂
- Mohs hardness
- 6
- Density
- 3.1-3.2 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic Crystals
- Cleavage
- Perfect On {110}
- Rarity
- Rare
- Uses
- Collector, Scientific Research
- Host rock
- Agpaitic Syenites
- Typical price
- $50-300 per specimen
Where rockhounds find ferro-ferri-fluoro-leakeite
Classic worldwide localities
- Norra Kärr, Sweden
- Khibiny Massif, Russia
Field-hunting tip
Look in agpaitic syenites country — that is the host setting where ferro-ferri-fluoro-leakeite typically forms. If you start seeing aegirine, microcline, nepheline 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 ferro-ferri-fluoro-leakeite?+
Where is ferro-ferri-fluoro-leakeite found?+
How much is ferro-ferri-fluoro-leakeite worth?+
What rocks look like ferro-ferri-fluoro-leakeite?+
What minerals are found with ferro-ferri-fluoro-leakeite?+
What kind of rock does ferro-ferri-fluoro-leakeite form in?+
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Find ferro-ferri-fluoro-leakeite on the map
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