Natrozippeite is a secondary uranium sulfate mineral that typically forms as bright yellow acicular crystal sprays or crusts on oxidized uranium ore. It is highly fluorescent under short-wave UV light, making it a sought-after species for fluorescent mineral collectors. Due to its radioactive nature, it requires careful handling and specialized storage.
Is this natrozippeite?
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 natrozippeite with a known reference. Natrozippeite sits at Mohs 2-3 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Natrozippeite leaves a pale yellow streak.
- 3Read the lusterHold the specimen under a strong light. Natrozippeite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, orange-yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: acicular crystals, efflorescences, crusts.
Often confused with
Natrozippeite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Streak differs — Natrozippeite leaves pale yellow, Zippeite leaves yellow; luster reads vitreous on Natrozippeite and pearly on Zippeite.
How to tell apart: Luster reads vitreous on Natrozippeite and pearly on Uranopilite.
Often found alongside natrozippeite
Minerals reported to co-occur with natrozippeite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₄(UO₂)₆(SO₄)₃(OH)₁₀·4H₂O
- Mohs hardness
- 2-3
- Density
- 4.15 g/cm³
- Colors
- Streak
- Pale Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Acicular Crystals, Efflorescences, Crusts
- Cleavage
- Perfect
- Fluorescence
- Bright Yellow-green Under UV
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Zones of Uranium-bearing Hydrothermal Veins
- Typical price
- $50-300 per specimen depending on size and quality
Where rockhounds find natrozippeite
Classic worldwide localities
- Jachymov, Czech Republic
- Lucky Mc Mine, Wyoming, USA
- Freedom No. 2 Mine, Utah, USA
- Schneckenstein, Germany
Field-hunting tip
Look in oxidized zones of uranium-bearing hydrothermal veins country — that is the host setting where natrozippeite typically forms. If you start seeing gypsum, metazeunerite, uranophane in float, you are in the right ground. Field specimens usually show a acicular crystals, efflorescences, crusts habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify natrozippeite?+
Where is natrozippeite found?+
How much is natrozippeite worth?+
Is natrozippeite safe to handle?+
What rocks look like natrozippeite?+
What minerals are found with natrozippeite?+
What kind of rock does natrozippeite form in?+
What is natrozippeite used for?+
Find natrozippeite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
