Vanadiocarpholite is an extremely rare member of the carpholite group, typically found as delicate, radiating fibrous bundles or acicular crystals. Collectors prize it for its unique yellow coloration and association with manganese-rich mineral assemblages. It is best identified through its distinct crystal habit and occurrence within low-grade metamorphic or hydrothermal environments.
Is this vanadiocarpholite?
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 vanadiocarpholite with a known reference. Vanadiocarpholite 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: nearly white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous to silky (acicular aggregates).
- 4Match the color rangeCompare against the expected color range: pale straw yellow, brown.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: acicular.
Often confused with
Vanadiocarpholite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Vanadiocarpholite leaves nearly white, Carpholite leaves white; luster reads vitreous to silky (acicular aggregates) on Vanadiocarpholite and silky, glistening on Carpholite.
How to tell apart: Streak differs, so Vanadiocarpholite leaves nearly white, Ferrocarpholite leaves greenish white; luster reads vitreous to silky (acicular aggregates) on Vanadiocarpholite and silky on Ferrocarpholite.
Often found alongside vanadiocarpholite
Minerals reported to co-occur with vanadiocarpholite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mn²⁺V³⁺AlSi₂O₆(OH)₄
- Mohs hardness
- 5-5.5
- Density
- 3.10 g/cm³
- Colors
- Pale straw yellowBrown
- Streak
- Nearly white
- Luster
- Vitreous to silky (acicular aggregates)
- Transparency
- Transparent
- Crystal system
- Orthorhombic
- Crystal habit
- Acicular
- Cleavage
- Perfect on {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Remobilized components were concentrated in veins and open fissures in silicified wood during metamorphism of Mn-ore bearing cherts
Where rockhounds find vanadiocarpholite
Classic worldwide localities
- Molinello mine, Liguria, Italy
Field-hunting tip
Where it forms: Remobilized components were concentrated in veins and open fissures in silicified wood during metamorphism of Mn-ore bearing cherts. If you start seeing volborthite, quartz in float, you are in the right ground. Typical habit: acicular. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify vanadiocarpholite?+
Where is vanadiocarpholite found?+
Is vanadiocarpholite safe to handle?+
What rocks look like vanadiocarpholite?+
What minerals are found with vanadiocarpholite?+
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Find vanadiocarpholite on the map
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