Jasp-agate is a transitional material between agate and jasper, exhibiting a mix of translucent agate banding and opaque, impurity-rich jasper zones. Collectors look for intricate patterns created by the intermingling of these phases, which take an excellent polish. It is frequently found as nodules or vein fillings in volcanic rocks where silica-rich fluids have crystallized.
Is this jasp-agate?
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 jasp-agate with a known reference. Jasp-Agate sits at Mohs 6.5-7, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: waxy.
- 4Match the color rangeCompare against the expected color range: red, yellow, brown, white, gray, multicolored.
- 5Look at form & habitCrystal system: trigonal. Typical habit: massive.
Often confused with
Jasp-Agate vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside jasp-agate
Minerals reported to co-occur with jasp-agate. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- SiO₂
- Mohs hardness
- 6.5-7
- Density
- 2.58-2.65 g/cm³
- Streak
- White
- Luster
- Waxy
- Transparency
- Opaque
- Crystal system
- Trigonal
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Common
- Uses
- Lapidary, Collector, Decorative
- Host rock
- hydrothermal veins and volcanic cavities
Where rockhounds find jasp-agate
2 mapped spotsClassic worldwide localities
- USA
- Mexico
- Brazil
- Madagascar
- India
Field-hunting tip
Where it forms: hydrothermal veins and volcanic cavities. If you start seeing quartz, chalcedony, hematite in float, you are in the right ground. Typical habit: massive. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Ohio. Start trip planning there.
More jasp-agate photos
Common questions
How do you identify jasp-agate?+
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What rocks look like jasp-agate?+
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Find jasp-agate on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
