Helmutwinklerite is a rare secondary arsenate mineral discovered primarily in the oxidation zones of the Tsumeb Mine. It typically occurs as delicate, bright yellow drusy coatings or tiny crystalline aggregates often found associated with other rare zinc-lead minerals.
Is this helmutwinklerite?
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 helmutwinklerite with a known reference. Helmutwinklerite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Helmutwinklerite leaves a yellow streak.
- 3Read the lusterHold the specimen under a strong light. Helmutwinklerite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, greenish-yellow.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: drusy, crusts, minute crystals.
Often confused with
Helmutwinklerite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Legrandite is the harder of the two (Mohs 4.5 vs. 2); streak differs — Helmutwinklerite leaves yellow, Legrandite leaves white.
How to tell apart: Mimetite is the harder of the two (Mohs 3.5-4 vs. 2); streak differs — Helmutwinklerite leaves yellow, Mimetite leaves white; luster reads vitreous on Helmutwinklerite and adamantine on Mimetite.
Often found alongside helmutwinklerite
Minerals reported to co-occur with helmutwinklerite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- PbZn₂(AsO₄)₂·2H₂O
- Mohs hardness
- 2
- Density
- 4.73 g/cm³
- Colors
- Streak
- Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Orthorhombic
- Crystal habit
- Drusy, Crusts, Minute Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Hydrothermal Lead-zinc Deposits
- Typical price
- $50-500+ depending on crystal size and quality
Where rockhounds find helmutwinklerite
Classic worldwide localities
- Tsumeb Mine, Namibia
Field-hunting tip
Look in oxidized hydrothermal lead-zinc deposits country — that is the host setting where helmutwinklerite typically forms. If you start seeing tsumcorite, adamite, smithsonite in float, you are in the right ground. Field specimens usually show a drusy, crusts, minute crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find helmutwinklerite on the map
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