sedimentary
Jasper (Cream/Yellow variety)
Silicon dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Cream, tan, and yellow with brown banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None. Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Cream, tan, and yellow with brown banding
- Luster
- Vitreous to waxy
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Cream, tan, and yellow with brown banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None. Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, occurring in various geological ages. Over time, the silica crystallizes into a dense, microcrystalline quartz structure.
Uses & applications
Used primarily in lapidary work for making cabochons, beads, and decorative ornaments. Also popular as a pocket stone or for tumbling.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek 'iaspis', meaning 'spotted stone'. It is known for its remarkable variety of patterns caused by chemical impurities during formation.
Field identification & locations
Identify by its hardness (will scratch glass), smooth waxy feel when polished, and opacity. Commonly found in riverbeds, beaches, and desert regions globally, particularly in the Western United States and India.
More like this
Other sedimentary specimens
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