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 5-5.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 4Match the color rangeCompare against the expected color range: colorless, rarely with greenish, yellowish tint.
- 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
- Ca₁₂Al₁₄O₃₂[(H₂O)₄F₂]
- Mohs hardness
- 5-5.5
- Density
- 2.873 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
- Major constituent of larnite pyrometamorphic rocks of the Hatrurim Complex (Mottled Zone)
Where rockhounds find fluorkyuygenite
Classic worldwide localities
- Hatrurim Basin, Negev Desert, Israel
Field-hunting tip
Where it forms: Major constituent of larnite pyrometamorphic rocks of the Hatrurim Complex (Mottled Zone). If you start seeing larnite, shulamitite, ye’elimite in float, you are in the right ground. Typical habit: anhedral to subhedral grains. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify fluorkyuygenite?+
Where is fluorkyuygenite found?+
What rocks look like fluorkyuygenite?+
What minerals are found with fluorkyuygenite?+
What kind of rock does fluorkyuygenite form in?+
What is fluorkyuygenite used for?+
Find fluorkyuygenite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
