Sedimentary Rock (Technically A Variety Of Chalcedony)

Polished red jasper

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and commonly mixed with chalcedony or other minerals

Tumbled carnelian (probable)

Chalcedony, microcrystalline quartz (SiO₂), orange iron-oxide variety

Tumbled carnelian (likely)

Cryptocrystalline quartz, SiO₂; reddish chalcedony colored mainly by iron oxides

Tumbled/rounded agate (likely mossy or brecciated chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Poppy Jasper

Jasper (variety of Chalcedony), SiO2 (Silicon Dioxide)

Polished gray agate or chalcedony

Microcrystalline quartz (SiO₂), likely gray chalcedony/agate

Red-and-blue jasper (likely ocean jasper or dyed/polished jasper)

Microcrystalline quartz, chiefly SiO₂; jasper is an opaque chalcedony variety colored by iron oxides and other impurities

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Agate Geode

Silicon Dioxide (SiO2) - variety Chalcedony/Quartz

Jasper

SiO2

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Chert (likely chalcedony-rich flint)

Microcrystalline quartz, SiO₂ (quartz/chalcedony)

Black obsidian

Volcanic glass (mostly rhyolitic silica glass; SiO₂-rich)

Agate

Chalcedony (SiO2)

Rainbow Moonstone

White Labradorite (Plagioclase Feldspar), (Na,Ca)(Al,Si)4O8

Chert / Flint

Chert (Cryptocrystalline Silica, SiO2)

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)

Labradorite (Larvikite variety)

Ternary feldspar (Anorthoclase), (Na,K)AlSi3O8

Red jasper pebble

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

White Agate (Chalcedony)

Chalcedony (SiO2)

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2)

Tumbled jasper (likely brecciated or leopard jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely gray/brown chalcedony with subtle agate banding

Tumbled quartz pebble (likely milky quartz or chalcedony)

Quartz, SiO₂; possibly microcrystalline quartz (chalcedony)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Red jasper pebble (probable)

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

Rainbow Moonstone

White Labradorite (var. of Anorthite), (Ca,Na)(Al,Si)4O8

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Banded Onyx (Calcite Marble)

Calcite (CaCO3) - Trap-rock or Cave Onyx

Dalmatian Jasper

Dalmatian Stone (Aplite with Arfvedsonite)

Polished pink agate/chalcedony pebble

Chalcedony (microcrystalline quartz, SiO₂), likely iron-stained agate

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Polished/tumbled agate (likely carnelian or iron-stained chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Red jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Agate

Agate (a variety of Chalcedony, SiO2)

Tumbled amber-colored chalcedony (likely carnelian)

Quartz, microcrystalline SiO₂; orange variety commonly called carnelian

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)