Preisingerite is a rare secondary bismuth arsenate mineral typically found in the oxidation zones of bismuth-bearing ore deposits. It occurs as small, delicate platy or acicular crystals often grouped in radial clusters, requiring magnification for proper identification.
Is this preisingerite?
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 preisingerite with a known reference. Preisingerite sits at Mohs 2.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Preisingerite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Preisingerite typically shows a adamantine luster.
- 4Match the color rangeCompare against the expected color range: yellow, yellowish-green, brown.
- 5Look at form & habitCrystal system: triclinic. Typical habit: platy crystals, radial aggregates, crusts.
Often confused with
Preisingerite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside preisingerite
Minerals reported to co-occur with preisingerite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Bi₃O₄(AsO₄)
- Mohs hardness
- 2.5
- Density
- 6.72 g/cm³
- Streak
- White
- Luster
- Adamantine
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Platy Crystals, Radial Aggregates, Crusts
- Cleavage
- Perfect On {001}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Bismuth-arsenic Hydrothermal Veins
- Typical price
- $50-300 per specimen
Where rockhounds find preisingerite
Classic worldwide localities
- San Antonio mine, Chihuahua, Mexico
- Schneeberg, Saxony, Germany
Field-hunting tip
Look in oxidized bismuth-arsenic hydrothermal veins country — that is the host setting where preisingerite typically forms. If you start seeing bismutite, mixite, quartz in float, you are in the right ground. Field specimens usually show a platy crystals, radial aggregates, crusts habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify preisingerite?+
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Find preisingerite on the map
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