Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)

Chert

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline quartz (SiO2)

Chert

Microcrystalline quartz (SiO2)

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.

Tumbled brown stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probably iron-stained jasper/chert

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Green polished gemstone (likely chrysoprase or aventurine)

Chrysoprase: microcrystalline quartz, SiO₂, colored by nickel; possible aventurine quartz: SiO₂ with fuchsite mica

Agate

Silicon Dioxide (Chalcedony variety), SiO2

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Ocean Jasper

Orbicular Jasper/Microcrystalline Quartz (SiO2)

Chert

Microcrystalline quartz (SiO2)

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

Red Jasper (with Quartz)

Silicon Dioxide (SiO2) with Hematite inclusions

Pink Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Honey-colored chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), probably iron-stained jasper/chalcedony

Banded Agate (specifically Carnelian Agate)

Silicon dioxide (SiO2) - Chalcedony variety

Polished multicolored jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert

Tumbled jasper or chalcedony pebble

Microcrystalline quartz, SiO₂ (likely jasper/chalcedony)

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Banded Calcite (often commercially sold as Mexican Onyx or Green Onyx)

Calcium Carbonate (CaCO3)

Ocean Jasper

Silicon Dioxide (SiO2) microcrystalline quartz aggregate with inclusions

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Red Tiger's Eye beads

Tiger's Eye (variety of Chalcedony, SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Quartz (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Green Calcite (Onyx Marble)

Calcium Carbonate (CaCO3)

Red jasper (likely polished/tumbled)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Chalcedony (Agate Nodule)

Silicon Dioxide (SiO2)

Tumbled blue chalcedony or pale aquamarine-like quartz

Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain