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
38 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, Connecticut, Georgia — 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.
