Green quartz, often known by the trade name prasiolite, is a rare color variety of quartz that typically appears in leek-green hues. While natural occurrences exist in specific hydrothermal environments, much of the market material is created by heat-treating amethyst. Collectors should look for vibrant, clear crystals, as the color can range from a pale mint to a deep, olive-toned green.
Is this green quartz?
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 green quartz with a known reference. Green Quartz sits at Mohs 7, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Green Quartz leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Green Quartz typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: green, leek-green, yellow-green.
- 5Look at form & habitCrystal system: trigonal. Typical habit: prismatic crystals.
Often confused with
Green Quartz vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside green quartz
Minerals reported to co-occur with green quartz. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- SiO₂
- Mohs hardness
- 7
- Density
- 2.65 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Trigonal
- Crystal habit
- Prismatic Crystals
- Cleavage
- None
- Rarity
- Uncommon
- Uses
- Gemstone, Collector
- Host rock
- Hydrothermal Veins and Volcanic Cavities
- Typical price
- $10-100 per carat for faceted stones
Where rockhounds find green quartz
5 mapped spotsClassic worldwide localities
- Brazil
- Poland
- Canada
- USA
Field-hunting tip
Look in hydrothermal veins and volcanic cavities country, the host setting where green quartz typically forms. If you start seeing amethyst, citrine, calcite in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Alabama, Massachusetts, North Carolina. Start trip planning there.
Common questions
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Find green quartz on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
