Sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Hardness: 6.5–7 on Mohs scale. Color: Deep brick red to brownish-red. Luster: Dull or waxy when raw, vitreous when polished. Structure: Microcrystalline/cryptocrystalline (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Deep brick red to brownish-red
- Luster
- Dull or waxy when raw, vitreous when polished
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Physical properties
Hardness: 6.5–7 on Mohs scale. Color: Deep brick red to brownish-red. Luster: Dull or waxy when raw, vitreous when polished. Structure: Microcrystalline/cryptocrystalline (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the deposition of silica from water or hydrothermal fluids into sediments or volcanic rocks. The red color is derived from iron inclusions (hematite). It can be found in formations ranging from the Precambrian Era to more recent geological ages.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative lapidary arts, and metaphysical practices. Historically used for making stone tools and seals due to its toughness.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek, and Latin. It is one of the traditional birthstones for March and is mentioned in the Bible as one of the stones in the High Priest's breastplate.
Field identification & locations
Identify in the field by its opaque nature (even on thin edges), its characteristic conchoidal fracture (curved like glass), and its inability to be scratched by a steel knife. Common locations include Brazil, India, South Africa, and the Southwestern United States.
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