Topaz is a highly prized silicate mineral often found in well-formed, prismatic crystals within granitic pegmatites. Collectors look for its characteristic high hardness and perfect basal cleavage, which distinguishes it from common quartz. While often blue, it naturally occurs in a wide spectrum of colors ranging from colorless to vibrant sherry, pink, and yellow hues.
Is this topaz?
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 topaz with a known reference. Topaz sits at Mohs 8 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Topaz leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Topaz typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brown, colorless, blue, pink, red.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: prismatic crystals with multi-faceted terminations.
Often confused with
Topaz vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside topaz
Minerals reported to co-occur with topaz. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Al₂SiO₄(F,OH)₂
- Mohs hardness
- 8
- Density
- 3.49-3.57 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Orthorhombic
- Crystal habit
- Prismatic Crystals with Multi-faceted Terminations
- Cleavage
- Perfect Basal
- Fluorescence
- Weak to Moderate; Varies By Locality
- Rarity
- Common
- Uses
- Gemstone, Collector
- Host rock
- Granite Pegmatites, Rhyolite Cavities, And High-temperature Hydrothermal Veins
- Typical price
- $10-100 per gram for rough; significantly higher for rare collector colors like imperial or sherry
Where rockhounds find topaz
38 mapped spotsClassic worldwide localities
- Brazil
- Pakistan
- Sri Lanka
- Russia
- USA
- Mexico
U.S. states with topaz
Each link opens a state-specific list of mapped rockhounding spots that produce topaz.
Field-hunting tip
Look in granite pegmatites, rhyolite cavities, and high-temperature hydrothermal veins country — that is the host setting where topaz typically forms. If you start seeing quartz, microcline, fluorite in float, you are in the right ground. Field specimens usually show a prismatic crystals with multi-faceted terminations habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Utah, New Hampshire, North Carolina — start trip planning there.
Common questions
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Find topaz on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
