Vanadinite Identification Guide
How to identify vanadinite by its bright red-orange hexagonal crystals, high density, and lead content, and separate it from pyromorphite and mimetite.
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What Vanadinite Looks Like
Vanadinite is a lead vanadate mineral famous for brilliant red, orange-red, and reddish-brown hexagonal prismatic crystals. The crystals are typically short, barrel-shaped or tabular hexagons, often forming sparkling clusters on a dark or ochre matrix in oxidized lead deposits. Luster is resinous to sub-adamantine (bright, almost glassy-greasy); transparency runs from translucent to nearly opaque. Vanadinite is notably heavy because of its lead content.
Step-by-Step Field-ID Checklist
- Note the color. Vivid red to orange-red is the headline feature.
- Look at crystal form. Short hexagonal prisms, often hollow-ended or barrel-shaped, in druzy clusters.
- Heft it. Heavy for its size (lead) - a key clue.
- Check luster. Resinous to sub-adamantine, bright.
- Hardness test. Soft - around 3-4; a knife scratches it, and it does not scratch glass.
- Streak test. White to pale yellowish.
Key Diagnostic Tests
- Mohs hardness: ~3-4 (soft).
- Streak: White to pale yellow/brownish-yellow.
- Cleavage/fracture: No cleavage; uneven to conchoidal fracture, brittle.
- Magnetism: None.
- Acid: Soluble in strong acids (not a casual field test); contains lead - handle with care, wash hands.
- Density: Very high, ~6.6-7.2 g/cm3 - among the heaviest of brightly colored minerals.
Common Look-Alikes
- Pyromorphite: Same crystal family (apatite group) and habit, but usually green-to-yellow (sometimes brown/orange); color and chemistry differ - pyromorphite is a lead phosphate. Bright red strongly favors vanadinite.
- Mimetite: Lead arsenate, usually yellow to orange-brown, hexagonal; overlaps with vanadinite and often needs chemistry to separate, but mimetite is rarely as vivid red.
- Crocoite: Red-orange but forms slender bladed/prismatic crystals (not stubby hexagons) and is a lead chromate.
- Wulfenite: Orange-red but tabular square/platy crystals, not hexagonal prisms.
- Realgar: Red but much softer and sulfurous; lower density.
Very high density plus short red hexagonal prisms plus softness (Mohs 3-4) plus white streak point to vanadinite; crocoite and wulfenite are ruled out by crystal shape.
Where It Is Found
Vanadinite forms in the oxidized zones of lead ore deposits in arid regions. The classic locality is Mibladen and Midelt, Morocco (superb red crystals), with notable material from Arizona and New Mexico (USA), Mexico, Namibia, and Zambia.
Frequently asked questions
How can you tell if it's real vanadinite?
Look for bright red-orange short hexagonal crystals, a resinous luster, low hardness (3-4, scratched by a knife), a white streak, and unusually high density from its lead content.
What does vanadinite look like?
Vanadinite forms brilliant red, orange-red, or reddish-brown barrel-shaped hexagonal crystals, usually in sparkling clusters on matrix.
Vanadinite vs pyromorphite: what's the difference?
They share crystal habit, but vanadinite is a lead vanadate that is typically vivid red, while pyromorphite is a lead phosphate usually green or yellow. Definitive separation may need chemical analysis.
Is vanadinite toxic?
It contains lead and vanadium, so handle specimens carefully, avoid inhaling dust, do not lick or ingest it, and wash your hands after handling.
Vanadinite identified by the community
Recent Vanadinite specimens identified with Rock Identifier.
