How to identify Zebra Jasper

To correctly identify Zebra Jasper (Zebra Jasper (a variety of Chalcedony/Microcrystalline Quartz)), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Distinctive banding of contrasting colors, most commonly black and white, or dark brown and cream/tan. Red and white variations also exist.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous to dull, sometimes waxy on fractured surfaces.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Fine-grained, smooth to slightly granular. Opaque.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Cryptocrystalline aggregates; no visible individual crystals to the naked eye.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   None. Exhibits conchoidal to splintery fracture.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Typically found in sedimentary environments, often associated with chert beds, iron formations, or areas where silica-rich fluids have permeated and altered existing rocks. Can be found in veins, nodules, or massive formations.

Key Facts

Hardness

6.5-7 on the Mohs scale

Specific Gravity

2.58-2.64 g/cm³

Crystal System

Trigonal (for quartz, the constituent mineral)

Color

Banded black and white, or dark brown and cream/tan; also red and white.

Luster

Vitreous to dull, sometimes waxy.

Transparency

Opaque

Fracture

Conchoidal to splintery

Cleavage

None

Composition

Silicon dioxide (SiO2) with various iron oxide impurities and other trace minerals.

Physical characteristics

• Crystal Habit: Cryptocrystalline aggregates, massive.
• Cleavage Type: None
• Fracture Type: Conchoidal to splintery
• Tenacity: Brittle
• Luster Type: Vitreous to dull

Explore Zebra Jasper