Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Orange tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange color commonly caused by iron oxides

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored chiefly by iron oxides

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Bloodstone

Chalcedony (Variety: Bloodstone / Heliotrope), SiO2

Banded Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

Polished banded agate geode slice

Agate, a microcrystalline variety of quartz (SiO₂), with chalcedony bands

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly iron-oxide stained

Polished banded agate, likely moss or dendritic agate

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese inclusions

Likely carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); carnelian is its iron-colored variety

Carnelian

Silicon Dioxide (Quartz variety, SiO2)

Tumbled brown jasper

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

Banded agate / chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂; varieties include chalcedony and jasper

Banded jasper (likely orbicular or brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide pigments and possible chalcedony

Tumbled red jasper

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

Red jasper (likely polished or dyed)

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

Polished carnelian agate

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

Tumbled agate

Agate, a banded variety of microcrystalline quartz (SiO₂; chalcedony)

Black cabochon gemstone, likely onyx or agate

Likely chalcedony (microcrystalline quartz, SiO₂); exact identification is not possible from the photo

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Polished pale chalcedony or quartz pebble

Microcrystalline quartz, SiO₂; possibly milky quartz/chalcedony

Jasper

Silicon dioxide (SiO2)

Ocean Jasper (Tumbled/Polished)

Silicon Dioxide (Microcrystalline Quartz) - SiO2

Honey-colored chalcedony (likely rough agate/jasper)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony

Agate (or Chalcedony)

SiO2 (Silicon Dioxide) - a cryptocrystalline variety of quartz

Tumbled jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Carnelian (Tumbled Pebble)

Quartz (Variety: Carnelian, SiO2)

Tumbled orange chalcedony (likely carnelian)

Carnelian, a microcrystalline quartz variety; SiO₂, commonly colored by iron oxides

Blue Lace Agate

Chalcedony (SiO2)

Fancy Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Tumbled agate/chalcedony (likely moss or plume agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide or mineral inclusions

Tumbled carnelian (likely)

Carnelian, a chalcedony variety of microcrystalline quartz (SiO₂), colored mainly by iron oxides

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

Tumbled agate

Microcrystalline quartz (chalcedony), SiO₂

Jasper

Silicon dioxide (SiO2)

Red Jasper

Microcrystalline quartz (SiO2) with Hematite (Fe2O3) impurities

Agate

SiO2 (Chalcedony/Quartz)

Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Polished/tumbled iron-rich jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides/hydroxides

Banded Agate (specifically Lake Superior Agate style)

Silicon Dioxide (SiO2) - Chalcedony variety

Agate and Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz