sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5–7 (Mohs scale), Color: Variegated mustard yellow, deep forest green, and earthy red with white quartz banding; Luster: Waxy to dull (earthy); Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Waxy to dull (earthy)
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Variegated mustard yellow, deep forest green, and earthy red with white quartz banding; Luster: Waxy to dull (earthy); Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the deposition of silica from water or hydrothermal vents, often incorporating mineral impurities (iron oxides for red/yellow patterns and silicate minerals for green). It typically dates from various periods, often found in ancient volcanic or sedimentary deposits.
Uses & applications
Commonly used for lapidary work, cabochons in jewelry, ornamental carvings, and as a decorative landscaping stone or collector's specimen.
Geological facts
The name 'Jasper' originates from the Greek word 'iaspis', meaning 'spotted stone'. This specific multi-colored variety is sometimes colloquially referred to as 'Fancy Jasper' or 'Polychrome Jasper' depending on the region of origin.
Field identification & locations
Identify in the field by its hardness (it can scratch glass), its opaque nature, and the smooth, curved (conchoidal) surface when it breaks. Commonly found in riverbeds, desert regions, and volcanic ash deposits in locations like India, Brazil, and the Western USA.
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