sedimentary
Siltstone Pebble with Veining
Siltstone
Hardness: 6-7, Color: Tan/brownish-grey with darker cross-cutting mineral veinlets, Luster: Dull/earthy, Grain size: Very fine-grained sedimentary rock, Texture: Smooth, water-worn beach or river pebble.
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Physical properties
Hardness: 6-7, Color: Tan/brownish-grey with darker cross-cutting mineral veinlets, Luster: Dull/earthy, Grain size: Very fine-grained sedimentary rock, Texture: Smooth, water-worn beach or river pebble.
Formation & geological history
Formed from the deposition and compaction of silt-sized mineral particles, predominantly quartz and feldspar, in quiet water depositional environments like lakes or floodplains. Subsequently fractured and filled with micro-veins, then smooth-rounded by stream or wave action.
Uses & applications
Commonly used in construction aggregate, landscaping, road base, and as decorative river rocks. Small specimens like this are primarily interest pieces for casual rockhounding.
Geological facts
The cross-cutting line across this pebble is a small quartz or micro-mineral filled fracture line (vein). Veins form when pressurized fluids flow through rock fractures and precipitate minerals into the open spaces.
Field identification & locations
Identified by its fine-grained, smooth texture, tan earthy color, and distinctive cross-cutting mineral veinlets. Commonly found along riverbeds, lakeshores, and ocean beaches worldwide.
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