mineral

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs); Color: Reddish-brown (this specimen); Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown (this specimen)
Luster: Vitreous to waxy

Identified April 1, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs); Color: Reddish-brown (this specimen); Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Formation & geological history

Forms when fine silica-rich materials are deposited in sedimentary or volcanic environments; red hues are typically due to iron inclusions. Can be found in deposits ranging from Precambrian to recent periods.

Uses & applications

Commonly used for lapidary work, jewelry (beads, cabochons), ornamental objects, and as a popular specimen for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone'. It was used in antiquity for cylinder seals and amulets.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of transparency (opaque), and smooth conchoidal fracture. Common in gravel beds and ancient volcanic regions.