sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed from the consolidation of fine-grained silica-rich sediments or volcanic ash. The red color is caused by iron (hematite) inclusions during the formation in hydrothermal veins or sedimentary beds.
Uses & applications
Commonly used in lapidary for making cabochons, beads, and decorative ornaments. It is also used as a grounding stone in metaphysical practices and occasionally in jewelry as a semi-precious stone.
Geological facts
Jasper has been used throughout history; it is mentioned in ancient literature and was used by ancient civilizations for cylinder seals and amulets. The name is derived from the Greek word 'iaspis', meaning 'spotted stone'.
Field identification & locations
Identify by its opaque nature (it does not transmit light), high hardness, and earthy red color. It is commonly found in riverbeds and coastal areas globally, particularly in India, Brazil, and the USA.
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