Talc is the softest known mineral and serves as the standard for 1 on the Mohs scale. It typically occurs as foliated or massive aggregates with a distinct greasy or soapy feel, often found in magnesium-rich metamorphic rocks.
Is this talc?
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 talc with a known reference. Talc sits at Mohs 1 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Talc leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Talc typically shows a pearly luster.
- 4Match the color rangeCompare against the expected color range: white, gray, green, silver, pale yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: foliated, platy, or massive.
Often confused with
Talc vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside talc
Minerals reported to co-occur with talc. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mg₃Si₄O₁₀(OH)₂
- Mohs hardness
- 1
- Density
- 2.58-2.83 g/cm³
- Streak
- White
- Luster
- Pearly
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Foliated, Platy, Or Massive
- Cleavage
- Perfect Basal
- Rarity
- Common
- Uses
- Industrial, Lapidary, Decorative
- Host rock
- Metamorphic Rocks
- Typical price
- $5-50 for small specimens, carved soapstone varies
Where rockhounds find talc
14 mapped spotsClassic worldwide localities
- Vermont, USA
- Ontario, Canada
- Val Malenco, Italy
- Pakistan
- China
Field-hunting tip
Look in metamorphic rocks country — that is the host setting where talc typically forms. If you start seeing magnesite, serpentine, chlorite in float, you are in the right ground. Field specimens usually show a foliated, platy, or massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in North Carolina, Massachusetts, New York — start trip planning there.
Common questions
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Find talc on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
