sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs), Color: Deep red to reddish-brown with cream, grey, or black veins. Luster: Vitreous to dull. Structure: Microcrystalline quartz (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Deep red to reddish-brown with cream, grey, or black veins
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Deep red to reddish-brown with cream, grey, or black veins. Luster: Vitreous to dull. Structure: Microcrystalline quartz (Trigonal). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.6-2.9.
Formation & geological history
Formed when jasper or other silicates are broken through tectonic activity and then re-cemented together by hematite or additional silica. This process occurs in sedimentary environments over millions of years, often in massive or nodules formations.
Uses & applications
Primarily used for ornamental purposes, including lapidary work, jewelry (beads, cabochons), home decor, and spiritual/metaphysical collecting. In construction, it may be used in crushed aggregate for high-end landscaping.
Geological facts
The name 'Brecciated' comes from the Italian 'breccia', meaning 'broken stones'. It is chemically identical to flint and chert but is distinguished by its vibrant color patterns and high iron oxide content which provides the deep red tones.
Field identification & locations
Identify in the field by its opaque reddish appearance and characteristic 'broken' or fragmented pattern cemented together. Common locations include Africa, Brazil, India, and the United States (specifically California and Arizona).
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