sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs), Color: Deep brick-red, Luster: Dull to vitreous, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Deep brick-red, Luster: Dull to vitreous, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica from water, typically in hydrothermal or sedimentary environments where iron oxides (like hematite) are present to provide the red pigment. It can also form during the low-grade metamorphism of silica-rich sediments.
Uses & applications
Commonly used in jewelry, lapidary arts, ornamental carvings, and as a decorative stone in landscaping. Historically used for making tools like scrapers and arrowheads due to its conchoidal fracture.
Geological facts
Red Jasper has been used by ancient civilizations for centuries; Egyptian amulets were frequently carved from it, and it was often referred to as 'the blood of Mother Earth.' It is a microcrystalline variety of quartz.
Field identification & locations
Identify by its deep red color and waxy to dull luster. It will not be scratched by a steel knife ($5.5-6$) but will scratch glass. Found globally, often in large deposits in India, Brazil, and the USA.
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