Crystal guide
How to Identify Jasper
SiO₂ (opaque chalcedony)
Jasper is opaque colorful chalcedony (quartz family, Mohs ~6.5–7). Identify it by body color throughout with conchoidal fracture — translucent banding points to agate, not jasper.
About Jasper
Jasper is opaque colorful chalcedony (quartz family, Mohs ~6.5–7). Identify it by body color throughout with conchoidal fracture — translucent banding points to agate, not jasper.
Jasper is filed under crystals in the RockScan directory. Composition: Opaque microcrystalline quartz with iron oxides/clays. It forms via silica replacement and sedimentary silica deposits. Typical occurrence: Worldwide; India, Australia, USA, Madagascar. For the broader method, see how to identify rock types.
Jasper properties
| Mohs hardness | 6.5–7 |
|---|---|
| Class | crystal |
| Scientific name | SiO₂ (opaque chalcedony) |
| Color | Red, yellow, brown, green; patterned |
| Luster | Vitreous to dull |
| Crystal system / texture | Trigonal (microcrystalline) |
| Composition | Opaque microcrystalline quartz with iron oxides/clays |
| Formation | Silica replacement and sedimentary silica deposits |
| Occurrence | Worldwide; India, Australia, USA, Madagascar |
How to identify Jasper
- Opaque chalcedony; Mohs ~6.5–7.
- Colors/patterns throughout.
- Conchoidal fracture like other silica.
Lookalikes to rule out
- Agate: Agate is more translucent/banded; jasper is opaque.
- Chert: Overlap exists — jasper is often colorful opaque chalcedony; chert is typically duller grey sedimentary silica.
- Painted rock: Artificial paint sits on surface; jasper color is throughout the stone.
Photo tips for Jasper ID
- Show opaque body color and any orbicular patterns.
- Wet vs dry comparison helps color.
- Include scale for patterned varieties.
Snap one specimen in natural light, then open the result in the online studio or the rock identifier app.
Jasper FAQ
How do you identify jasper?
Opaque colorful silica with chalcedony toughness. Distinguish from agate by opacity.
Is jasper a mineral?
It is a rock/mineraloid variety of microcrystalline quartz (chalcedony).
Jasper vs painted stone?
Color goes through jasper; paint chips off.
How to identify jasper
Collectors search “how to identify jasper” when an opaque colorful silica cobble might be agate, chert, or painted rock. Use this field checklist:
- Opacity: chalcedony that stays opaque through the body — translucent banding points to agate.
- Hardness: Mohs ~6.5–7 silica; conchoidal fracture like other quartz-family stones.
- Color throughout: red, yellow, brown, green, or patterned — color is in the stone, not a surface coat.
- Vs paint: artificial paint sits on the surface; jasper color continues on a fresh break.
- Photo first: wet/dry color pair plus opaque body shot, then confirm with RockScan.
Jasper vs agate vs chert vs painted rock
- Agate: More translucent with banding; jasper is opaque chalcedony.
- Chert: Often drabber microcrystalline silica; jasper is the colorful opaque chalcedony habit.
- Painted rock: Paint is a surface film; jasper color runs through the fracture.
Photo tips for jasper ID
Opaque body color, any orbicular patterns, and a wet vs dry pair. Compare agate, flint, and quartz, then confirm in the online studio or rock identifier app.
Related crystals to compare
Browse all: rocks · minerals · crystals · directory · what rock is this · rock vs mineral vs crystal. Confirm with the online studio or rock identifier app.