metamorphic
Banded Quartz with Host Rock / Quartz Vein Pebble
Silicon Dioxide (SiO2) in Metamorphic Matrix
Hardness around 7 (quartz section). Colors include tan/peach, milky white, and dark grey-black bands. Vitreous to dull luster, dense, fine-grained to microcrystalline structure.
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Physical properties
Hardness around 7 (quartz section). Colors include tan/peach, milky white, and dark grey-black bands. Vitreous to dull luster, dense, fine-grained to microcrystalline structure.
Formation & geological history
Formed when hydrothermal fluids rich in dissolved silica penetrated fractures in a host rock (such as slate, schist, or basalt), depositing quartz veins. Subsequent erosion and water action rounded it into a river pebble.
Uses & applications
Primarily collected as a decorative beach or river pebble; used for landscape decoration and lapidary practice.
Geological facts
Quartz veins are often target indicators for prospectors, as precious metals like gold and silver commonly precipitate within hydrothermal quartz veins in host rocks.
Field identification & locations
Easily identified in the field by the distinct light-colored quartz band contrasting sharply against dark host rock layers. Very common along riverbeds, gravel pits, and glaciated beaches.
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