Fluorkyuygenite is a very rare mineral belonging to the mayenite supergroup, first described from the Hatrurim Formation in Israel. It typically occurs as small, clear, yellowish grains formed under high-temperature, low-pressure pyrometamorphic conditions. It is primarily a specimen of interest for advanced mineral collectors due to its geological rarity.
Is this fluorkyuygenite?
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 fluorkyuygenite with a known reference. Fluorkyuygenite 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. Fluorkyuygenite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Fluorkyuygenite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, yellowish-orange.
- 5Look at form & habitCrystal system: cubic. Typical habit: anhedral to subhedral grains.
Often confused with
Fluorkyuygenite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside fluorkyuygenite
Minerals reported to co-occur with fluorkyuygenite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Ca₁₂Al₁₄O₃₂F₂
- Mohs hardness
- 5-6
- Density
- 2.95 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Cubic
- Crystal habit
- Anhedral to Subhedral Grains
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Pyrometamorphic Rocks of The Hatrurim Formation
- Typical price
- n/a
Where rockhounds find fluorkyuygenite
Classic worldwide localities
- Hatrurim Formation, Israel
- Jordan
Field-hunting tip
Look in pyrometamorphic rocks of the hatrurim formation country — that is the host setting where fluorkyuygenite typically forms. If you start seeing ettringite, gehlenite, brownmillerite in float, you are in the right ground. Field specimens usually show a anhedral to subhedral grains habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find fluorkyuygenite on the map
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