Muscovite is the most common mica mineral, easily identified by its perfect basal cleavage that allows it to be split into thin, flexible, transparent sheets. It is a primary constituent of many igneous and metamorphic rocks and is frequently found as large 'books' in pegmatites. Collectors look for well-formed pseudohexagonal crystals or large, flawless sheets.
Is this muscovite?
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 muscovite with a known reference. Muscovite sits at Mohs 2.5-3 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Muscovite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Muscovite typically shows a pearly luster.
- 4Match the color rangeCompare against the expected color range: colorless, yellow, brown, green, white.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: tabular crystals, scaly aggregates, micaceous sheets.
Often confused with
Muscovite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside muscovite
Minerals reported to co-occur with muscovite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- KAl₂(AlSi₃O₁₀)(OH)₂
- Mohs hardness
- 2.5-3
- Density
- 2.76-2.88 g/cm³
- Streak
- White
- Luster
- Pearly
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Tabular Crystals, Scaly Aggregates, Micaceous Sheets
- Cleavage
- Perfect Basal
- Rarity
- Common
- Uses
- Industrial, Collector, Electrical Insulation
- Host rock
- Granite Pegmatites, Metamorphic Schists, Gneisses
- Typical price
- $5-50 for typical specimens, higher for large display books
Where rockhounds find muscovite
34 mapped spotsClassic worldwide localities
- Brazil
- Russia
- India
- Canada
- USA
U.S. states with muscovite
Each link opens a state-specific list of mapped rockhounding spots that produce muscovite.
Field-hunting tip
Look in granite pegmatites, metamorphic schists, gneisses country — that is the host setting where muscovite typically forms. If you start seeing quartz, feldspar, beryl in float, you are in the right ground. Field specimens usually show a tabular crystals, scaly aggregates, micaceous sheets habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Maine, Georgia, North Carolina — start trip planning there.
Common questions
How do you identify muscovite?+
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Find muscovite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
