sedimentary

Quartz-veined Sedimentary Rock

Sedimentary rock with hydrothermal quartz veins

Hardness varies (host rock typically 3-4, quartz veins are 7 on Mohs scale); dark grey to black host with bright white/off-white intersecting veins; dull to vitreous luster; massive to fine-grained crystal structure; specific gravity around 2.6-2.7

Identified August 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through lithification of sediments, later fractured by tectonic stress, allowing hydrothermal fluids rich in silica to precipitate quartz into the cracks. Geological age varies widely depending on location.

Uses & applications

Used primarily as decorative landscaping stones, gravel, garden pathway borders, or as fascinating specimens for rock collectors.

Geological facts

These distinctive patterns are often referred to as 'wishbone rocks' or 'veined pebbles' by beachcombers and rockhounds. The quartz veins are harder than the surrounding host rock, causing them to weather out slower and stand in relief on weathered surfaces.

Field identification & locations

Easily identified by the striking contrast of light-colored mineral veins cutting through a darker matrix stone. Frequently found in streambeds, glacial till, and coastal beaches where water action has tumbled and smoothed the edges.

Other sedimentary specimens

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Sandstone or Siltstone

Arenite (if sandstone)

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Quartz pebble

Silicon dioxide (SiO2)

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Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

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Sedimentary Sandstone

Arenite (Sedimentary Rock)

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Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

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