sedimentary
Banded Sandstone / Quartzite with Mineral Veins
Sedimentary rock (Quartz arenite with iron oxide/silica banding)
Hardness of 6-7 on the Mohs scale, predominantly tan, brown, and dark gray banding, vitreous to dull luster, granular to cryptocrystalline structure, specific gravity around 2.65.
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Physical properties
Hardness of 6-7 on the Mohs scale, predominantly tan, brown, and dark gray banding, vitreous to dull luster, granular to cryptocrystalline structure, specific gravity around 2.65.
Formation & geological history
Formed from the accumulation, compaction, and cementation of quartz sand grains in marine, desert, or river environments over millions of years, often subsequently altered by mineral-rich hydrothermal fluids filling fractures.
Uses & applications
Used primarily as decorative landscaping stones, raw material for gravel, and collected by rockhounds and lapidary hobbyists.
Geological facts
The distinct dark bands typically indicate iron oxide or manganese staining that has seeped through micro-fractures in the parent rock over geological timescales.
Field identification & locations
Easily identified by distinct contrasting bands on weathered surfaces; commonly found in riverbeds, glacial tills, and sedimentary basins worldwide.
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Banded Siltstone / Mudstone Pebble
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