sedimentary
Yellow Jasper
Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions
Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or tan with darker veins; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6–2.9
- Hardness
- 6
- Color
- Yellow, mustard, or tan with darker veins
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or tan with darker veins; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6–2.9
Formation & geological history
Formed through the accumulation of fine silica-rich sediment or volcanic ash. Over millions of years, heat and pressure consolidate these materials into a dense, opaque rock. Often found in hydrothermal veins or as nodules in sedimentary rocks.
Uses & applications
Extensively used in lapidary for cabochons, beads, and decorative carvings. Historically used for making tools and seals. It is also a popular stone for collectors and practitioners of crystal healing.
Geological facts
Jasper has been a favorite gemstone since antiquity, mentioned in diverse historical texts including the Bible. The word 'jasper' stems from the Greek 'iaspis', meaning 'spotted stone.' Yellow varieties specifically owe their color to the presence of goethite or limonite.
Field identification & locations
Identify by its opacity (even on thin edges) and waxy luster when polished. Frequently found in riverbeds or coastal areas where harder minerals accumulate after erosion. Major sources include Brazil, Egypt, India, and the United States (Oregon/Idaho).
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