sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown with grey/blue bands; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Reddish-brown with grey/blue bands
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown with grey/blue bands; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich micro-organisms or chemical precipitates in sedimentary environments. Its distinct banding is caused by variations in mineral impurities (mostly iron oxides) during rhythmic deposition or chemical replacement over millions of years.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons, beads), decorative objects, and as a popular specimen for rock tumbling and crystal healing collections.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted or speckled stone. Many cultures throughout history have believed it carries protective or grounding properties.
Field identification & locations
Identify in the field by its opacity (unlike translucent agate), high hardness (cannot be scratched by a steel knife), and smooth, waxy feel when polished. It is commonly found in riverbeds, deserts, and volcanic regions globally, notably in India, Brazil, and the USA (Pacific Northwest).
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