sedimentary
Red Jasper (nodule)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to greasy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed when fine volcanic ash or silica-rich sediments are consolidated and undergo silicification. The red color is derived from iron impurities that oxidize during the formation process through hydrothermal or sedimentary deposition.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), interior decoration, and as a healing stone in metaphysical practices. Historically used for making tools due to its conchoidal fracture.
Geological facts
Jasper has been used throughout human history, ranging from ancient Egyptian amulets to Minoan seals. It is the primary components of many 'banded iron formations' which are some of the oldest rock units on Earth.
Field identification & locations
Identify in the field by its opacity (unlike translucent carnelian), its red streak on a porcelain plate, and its inability to be scratched by a steel knife. Frequently found in riverbeds, deserts, and coastal regions globally.
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