sedimentary
Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
Hardness: 6.5-7 (Mohs scale), Color: Red, brown, and black, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Red, brown, and black, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
Formation & geological history
Formed from silica-rich fluids filtering through sedimentary deposits, often associated with iron-rich environments. The coloration is due to the presence of hematite or other iron oxides during the crystallization process.
Uses & applications
Used primarily for ornamental purposes, lapidary art, jewelry, and as a collector's specimen. In industry, high-purity silica is used for various technological applications.
Geological facts
Jasper is a variety of chalcedony that is opaque due to high mineral impurities. The red coloring in this specific specimen is a classic indicator of iron inclusions reaching up to 20% of the stone's composition.
Field identification & locations
Identify by its opacity, hardness (will scratch glass), and conchoidal fracture. Check for the banded or mottled patterns of rust-red and dark grey. It is commonly found in areas of volcanic activity or ancient seabed deposits.
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