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
Where rockhounds find fluorkyuygenite
Classic worldwide localities
- Hatrurim Formation, Israel
- Jordan
Field-hunting tip
Look in pyrometamorphic rocks of the hatrurim formation country, 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
How do you identify fluorkyuygenite?+
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What rocks look like fluorkyuygenite?+
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Find fluorkyuygenite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
