Huntite is a soft, chalky carbonate mineral that often occurs as fine-grained, snow-white earthy masses. It is frequently found in sedimentary lake deposits or as a secondary mineral in caves and is highly prized by collectors for its striking white color and intense fluorescence under ultraviolet light.
Is this huntite?
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 huntite with a known reference. Huntite sits at Mohs 1-2 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Huntite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Huntite typically shows a dull luster.
- 4Match the color rangeCompare against the expected color range: white, off-white.
- 5Look at form & habitCrystal system: trigonal. Typical habit: massive, chalk-like, powdery aggregates.
Often confused with
Huntite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Magnesite is the harder of the two (Mohs 3.5-4.5 vs. 1-2); luster reads dull on Huntite and vitreous on Magnesite.
How to tell apart: Dolomite is the harder of the two (Mohs 3.5-4 vs. 1-2); luster reads dull on Huntite and vitreous on Dolomite.
How to tell apart: Calcite is the harder of the two (Mohs 3 vs. 1-2); luster reads dull on Huntite and vitreous on Calcite.
Often found alongside huntite
Minerals reported to co-occur with huntite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mg₃Ca(CO₃)₄
- Mohs hardness
- 1-2
- Density
- 2.7 g/cm³
- Streak
- White
- Luster
- Dull
- Transparency
- Opaque
- Crystal system
- Trigonal
- Crystal habit
- Massive, Chalk-like, Powdery Aggregates
- Cleavage
- None
- Fluorescence
- Bright White or Yellow Under SW UV
- Rarity
- Common
- Uses
- Industrial, Collector
- Host rock
- Sedimentary Environments, Specifically Lake Beds and Secondary Cave Deposits
- Typical price
- $5-30 for small specimens
Where rockhounds find huntite
Classic worldwide localities
- Nevada, USA
- Queensland, Australia
- Greece
- Turkey
- France
Field-hunting tip
Look in sedimentary environments, specifically lake beds and secondary cave deposits country — that is the host setting where huntite typically forms. If you start seeing magnesite, dolomite, calcite in float, you are in the right ground. Field specimens usually show a massive, chalk-like, powdery aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find huntite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
