Wonderstone is a rhyolitic tuff or volcanic ash that has been stained by iron oxides, creating intricate, swirling patterns and vivid bands of color. It is highly sought after by lapidaries for its unique banding, which polishes to a smooth, attractive finish. Collectors often find it in weathered, massive outcrops where the contrasting colors are most visible.

Hardness

6.5-7

Mohs

Luster

Dull

Transparency

Opaque

sedimentarycommon

Wonderstone

Hardness: 6.5-7
Luster: Dull
Transparency: Opaque

Is this wonderstone?

3-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch wonderstone with a known reference. Wonderstone sits at Mohs 6.5-7, softer than the next harder reference, harder than the previous one.
2
Read the luster
Hold the specimen under a strong light. Luster: dull.
3
Match the color range
Compare against the expected color range: red, yellow, brown, orange, white, black.

Often confused with

Wonderstone vs. its common look-alikes, and how to tell them apart in the field.

mineral

Jasper

Mohs 6.5-7

How to tell apart: Luster reads dull on Wonderstone and waxy on Jasper.

How to tell apart: Luster reads dull on Wonderstone and waxy on Chert.

Compare →

Often found alongside wonderstone

Minerals reported to co-occur with wonderstone. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Mohs hardness: 6.5-7
Density: 2.6 g/cm³
Colors: Red Yellow Brown Orange White Black
Luster: Dull
Transparency: Opaque
Rarity: Common
Uses: Lapidary, Decorative
Host rock: volcanic ash deposits

Where rockhounds find wonderstone

8 mapped spots

Classic worldwide localities

Utah, USA
Nevada, USA
South Africa
Australia

Field-hunting tip

Where it forms: volcanic ash deposits. If you start seeing quartz, feldspar in float, you are in the right ground. In the U.S., the densest reported localities are in Nevada, Utah. Start trip planning there.

Browse 8 U.S. spots for wonderstone →

Common questions

How do you identify wonderstone?+

Mohs hardness is 6.5-7. Luster: dull. Common colors include red, yellow, brown, orange.

Where is wonderstone found?+

Notable localities include Utah, USA; Nevada, USA; South Africa; Australia.

Can I find wonderstone in the United States?+

RockHoundR maps 8 wonderstone rockhounding spots across 2 U.S. states. The top states are Nevada, Utah.

What rocks look like wonderstone?+

Wonderstone is most often confused with Jasper, Rhyolite, Chert. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with wonderstone?+

Wonderstone commonly co-occurs with Quartz, Feldspar. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does wonderstone form in?+

Where it forms: volcanic ash deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is wonderstone used for?+

Wonderstone is used in lapidary, decorative.

Find wonderstone on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.