sedimentary

Banded Agate

Silicon dioxide (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, and crypto-crystalline quartz structure with distinct color bands.

Identified October 30, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, and crypto-crystalline quartz structure with distinct color bands.

Formed through the deposition of silica-rich groundwater in cavities of ancient volcanic or sedimentary rocks over millions of years.

Widely used in jewelry, ornamental carvings, polished specimens, and lapidary art.

Agate bands represent successive layers of microscopic quartz crystals deposited inside gas cavities in volcanic rock.

Identified by its distinctive curved color banding and waxy luster; found globally in volcanic regions and river gravels.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)