sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
Hardness varies around 5 to 7 depending on quartz content, dark brown to grey color with a distinct white or light-grey mineral vein running through it, dull to vitreous luster on the vein, microcrystalline structure.
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Physical properties
Hardness varies around 5 to 7 depending on quartz content, dark brown to grey color with a distinct white or light-grey mineral vein running through it, dull to vitreous luster on the vein, microcrystalline structure.
Formation & geological history
Formed through the accumulation and lithification of sediment, subsequently fractured and hydrothermally injected with mineral-rich fluids (typically quartz or calcite) millions of years ago.
Uses & applications
Predominantly used for geological study, specimen collection, or as a decorative tumbled stone.
Geological facts
Vein structures like the one visible in this specimen are natural conduits where mineral-rich hydrothermal waters precipitate crystals into cracks within older host rocks.
Field identification & locations
Commonly found in stream beds and coastal areas where water erosion exposes banded or veined pebbles. Easily identified by contrasting mineral bands against a darker matrix.
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