sedimentary
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Hexagonal/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: Hexagonal/Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica in hydrothermal veins or as a secondary mineral in volcanic rock or sedimentary beds. The red color is caused by iron (hematite) inclusions within the silica.
Uses & applications
Commonly used for ornamental decorations, jewelry (cabochons and beads), pocket stones, and lapidary work.
Geological facts
Jasper has been used as a gemstone since antiquity; it was known as the 'supreme nurturer' in ancient folklore and was often used for seals and amulets in Mesopotamia and Egypt.
Field identification & locations
Identify in the field by its opaque nature (unlike translucent carnelian), its high hardness that scratches glass, and its smooth, waxy surface when polished. Found worldwide with major deposits in India, Brazil, and the USA.
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