sedimentary

African Turquoise (Jasper)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz with inclusions

Hardness: 6.5–7 (Mohs scale); Color: Teal, green-blue, and light green with black/brown matrix inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture).

Hardness: 6
Luster: Vitreous to waxy

Identified March 14, 2026More sedimentary →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the accumulation of volcanic ash and silicate-rich fluids in sedimentary layers over millions of years. Despite the name, it is a form of jasper (chalcedony) primarily sourced from Africa.

Uses & applications

Primarily used in the jewelry industry for beads, cabochons, and decorative items. In spiritual communities, it is often marketed as a stone of 'evolution' and growth.

Geological facts

African Turquoise is not actually turquoise; it is a type of jasper. The matrix seen in the beads is caused by mineral inclusions like iron and copper, which can give it a turquoise-like appearance when polished.

Field identification & locations

Identify in the field by its hardness (will scratch glass, unlike real turquoise which is softer) and its distinct mottled patterns. Commonly found in sub-Saharan African regions. Collectors should look for unique matrix patterns.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Shale or Slaty Mudstone

Argillaceous sedimentary rock

sedimentary

Chert Breccia

Brecciated Chert (Microcrystalline Silica)

sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2)

sedimentary

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

sedimentary