Where is Jasper found?

Jasper occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.

Where to find Jasper

Collecting tips

1. Look for Silica-Rich Environments. Jasper often forms in areas with past volcanic activity, hydrothermal alteration, or sedimentary environments where silica precipitation was prevalent. Riverbeds and gravel deposits can also yield tumbled jasper.
2. Identify Opaque, Fine-Grained Material. Jasper is opaque and has a very fine-grained texture. Look for dense, hard rocks that do not show visible crystal structure. Its hardness (7 on Mohs scale) means it will scratch glass.
3. Observe Color and Pattern. The most distinguishing feature of jasper is its wide array of colors and often intricate patterns. Look for reds, browns, yellows, greens, and multi-colored specimens with banding, orbicular structures, or brecciated textures.
4. Check for Conchoidal Fracture. When broken, jasper will exhibit a smooth, shell-like (conchoidal) fracture, similar to flint or obsidian.

Quick Check

Color:

Opaque, highly variable (red, brown, yellow, green, blue, black, multicolored)

Luster:

Vitreous to dull, waxy when polished

Streak:

White

Explore Jasper