Zebra Jasper
Silicon dioxide (SiO2), microcrystalline quartz
A black-and-white striped chalcedony-quartz rock whose bold zebra-like banding makes it a popular ornamental and lapidary stone.
- Mohs hardness
- 6.5-7
- Color
- White to grey with black or dark banding/stripes
- Type
- sedimentary
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Overview
Zebra Jasper is a banded variety of jasper, an opaque microcrystalline quartz, marked by bold black (or dark grey/brown) and white stripes that resemble a zebra's coat. Technically much commercial "zebra jasper" straddles the line between jasper and marble or other matrix; true jasper-type material is silica-rich and hard.
The contrasting bands form from layered deposition of silica with varying mineral impurities, often iron oxides or other dark minerals. The pattern can be straight, wavy, or chaotic.
It is durable, takes a fine polish, and is widely used for tumbled stones, beads, and carvings, valued for its graphic, high-contrast look.
Formation & geology
Zebra Jasper forms where silica-rich solutions infiltrate and replace sediment or fill spaces in rock, depositing microcrystalline quartz in layers. Variations in the trace minerals present during deposition, particularly dark iron- or manganese-bearing phases versus pure silica, produce the alternating dark and light bands.
Some material classed as zebra jasper or "zebra stone" is actually a fine sedimentary rock or metamorphosed sediment with rhythmic banding rather than pure chalcedony. Notable sources include South Africa, India, Australia (the famous Kununurra zebra rock), and Mexico.
How to identify it
Look for strong, opaque black-and-white (or grey/brown-and-white) banding with a hardness around 6.5-7 and a waxy to dull luster on broken surfaces, glassy when polished. True jasper will not scratch with a steel knife.
It shows conchoidal to splintery fracture and a white streak. Distinguish it from zebra marble (calcite-based, much softer at hardness 3, fizzes in acid) by the hardness test and acid test, and from howlite (white with grey veins, softer at 3.5).
Dyed or assembled imitations show unnaturally even color; natural zebra jasper banding is irregular and varied.
Uses & significance
Zebra Jasper is used mainly as an ornamental and lapidary stone: tumbled stones, cabochons, beads, spheres, pyramids, and small carvings. Its toughness and bold contrast make it popular for jewelry and decorative objects.
It polishes to a smooth, high-contrast finish that emphasizes the striping. In the metaphysical market it is promoted as a grounding, balancing, and motivating stone, said to encourage stability and endurance, though these claims are not scientific.
It is inexpensive and abundant, prized for appearance and durability rather than rarity.
Frequently asked questions
Is zebra jasper a jasper or a marble?
Commercial material varies: true zebra jasper is hard silica-rich jasper, but some "zebra stone" is softer marble or banded sedimentary rock. A hardness and acid test distinguishes them.
What gives zebra jasper its stripes?
Alternating layers of silica with dark iron- or manganese-bearing minerals against lighter pure silica create the black-and-white banding.
How can I tell zebra jasper from howlite?
Zebra jasper is hard (6.5-7) and will not scratch easily; howlite is soft (3.5) with chalky white body and grey veining.
Is zebra jasper safe to get wet?
Yes, hard silica-based zebra jasper tolerates water well, though softer marble-type material should be kept dry.
Is zebra jasper valuable?
It is common and affordable, valued for its bold pattern and durability rather than as a precious stone.
Zebra Jasper guides
In-depth guides for identifying, valuing, and understanding Zebra Jasper.
Zebra Jasper identified by the community
Real specimens identified with Rock Identifier.
