sedimentary
Jasper and Mudstone Composite
Silicified Sedimentary Rock / Jasperoid Pebble
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, opaque with mottled green and yellow-brown coloration, microcrystalline quartz structure with conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, opaque with mottled green and yellow-brown coloration, microcrystalline quartz structure with conchoidal fracture.
Formation & geological history
Formed through the deposition of fine-grained mud and subsequent silicification where silica-rich fluids replaced original minerals over millions of years in marine or lacustrine environments.
Uses & applications
Used for lapidary arts, ornamental carving, tumbling, wire-wrapping, and as collector specimens.
Geological facts
These polished pebbles show distinct contrasting veining and color patterns resulting from differential weathering and secondary mineral infiltration such as iron oxides.
Field identification & locations
Can be identified by its high hardness (scratching glass), smooth waxy feel when polished, and distinct color banding or webbed matrix; commonly found in riverbeds and ancient alluvial deposits.
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