Ferro-fluoro-pedrizite is a rare lithium-rich amphibole found primarily in alkaline granitic pegmatites. It typically occurs as small prismatic crystals that are challenging to distinguish from other amphiboles without specialized chemical analysis.
Is this ferro-fluoro-pedrizite?
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-fluoro-pedrizite with a known reference. Ferro-fluoro-pedrizite 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. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 4Match the color rangeCompare against the expected color range: yellow, pale brown, colorless.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often confused with
Ferro-fluoro-pedrizite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Ferro-fluoro-pedrizite leaves white, Ferro-pedrizite leaves pale gray.
How to tell apart: Streak differs, so Ferro-fluoro-pedrizite leaves white, Arfvedsonite leaves deep bluish gray, gray-green.
Often found alongside ferro-fluoro-pedrizite
Minerals reported to co-occur with ferro-fluoro-pedrizite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaLi₂(Fe₂Al₂Li)Si₈O₂₂F₂
- Mohs hardness
- 5-6
- Density
- 3.10 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic crystals
- Cleavage
- Perfect in two directions
- Rarity
- Rare
- Uses
- Collector
- Host rock
- granite pegmatites
Where rockhounds find ferro-fluoro-pedrizite
Classic worldwide localities
- Pedriza Massif, Spain
Field-hunting tip
Where it forms: granite pegmatites. If you start seeing albite, quartz, microcline in float, you are in the right ground. Typical habit: prismatic crystals. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify ferro-fluoro-pedrizite?+
Where is ferro-fluoro-pedrizite found?+
What rocks look like ferro-fluoro-pedrizite?+
What minerals are found with ferro-fluoro-pedrizite?+
What kind of rock does ferro-fluoro-pedrizite form in?+
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Find ferro-fluoro-pedrizite on the map
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