sedimentary

Chert (specifically Yellow/Honey Jasper variety)

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Honey yellow to tan with translucent edges; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microscopic); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7

Hardness: 6
Color: Honey yellow to tan with translucent edges
Luster: Waxy to vitreous

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich fluids in sedimentary basins or when hydrothermal fluids replace organic material or minerals in limestone. This specimen shows water-worn rounding, suggesting it was transport by a river or stream.

Uses & applications

Used historically for stone tools (knapping) due to its sharp edges; currently used for lapidary work, jewelry (cabochons), and as landscaping decorative stone.

Geological facts

Yellow jasper is often associated with the 'Solar Plexus' in metaphysical circles; historically, flint and chert were the primary materials for human survival tools for millions of years.

Field identification & locations

Identify in the field by its characteristic 'conchoidal' (shell-like) fracture patterns and ability to scratch glass. Commonly found in gravel beds, riverbanks, and embedded in limestone outcrops worldwide.

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