Ferro-ferri-pedrizite is a very rare member of the amphibole group defined by its specific lithium and iron content. It typically forms as small, elongated prisms within evolved granite pegmatites and is primarily of interest to advanced mineralogists and systematic collectors.
Is this ferro-ferri-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-ferri-pedrizite with a known reference. Ferro-ferri-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. Ferro-ferri-pedrizite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferro-ferri-pedrizite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: pale yellow, pale green.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often confused with
Ferro-ferri-pedrizite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside ferro-ferri-pedrizite
Minerals reported to co-occur with ferro-ferri-pedrizite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- NaNa₂(Fe³⁺₂Fe²⁺₂Li)Si₈O₂₂ (OH)₂
- Mohs hardness
- 5-6
- Density
- 3.16 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic Crystals
- Cleavage
- Perfect On {110}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Granite Pegmatites
- Typical price
- expensive collector mineral
Where rockhounds find ferro-ferri-pedrizite
Classic worldwide localities
- Pedriza Massif, Spain
Field-hunting tip
Look in granite pegmatites country — that is the host setting where ferro-ferri-pedrizite typically forms. If you start seeing albite, quartz, k-feldspar 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-pedrizite?+
Where is ferro-ferri-pedrizite found?+
How much is ferro-ferri-pedrizite worth?+
What rocks look like ferro-ferri-pedrizite?+
What minerals are found with ferro-ferri-pedrizite?+
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Find ferro-ferri-pedrizite on the map
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