Mineralish (Variety Of Chalcedony)

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Tumbled agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely brown/banded agate or jasper

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments

Jasper (Green Jasper/Heliotrope variety)

Silicon Dioxide (SiO2)

Polished agate (likely carnelian/mossy chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide banding and possible inclusions

Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Jasper (Cream/Yellow variety)

Silicon dioxide (SiO2)

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled jasper (likely picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety uncertain from the photo

Polished reddish-brown gemstone, likely carnelian

Carnelian: chalcedony, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Chrysoprase

Chalcedony (cryptocrystalline silica containing nickel); Chemical Formula: SiO2 with Ni impurities

Chalcedony

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Tumbled chalcedony (likely moss or plume variety)

Microcrystalline quartz, SiO₂

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Iron-stained chalcedony or jasper

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony

Polished brown agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony; agate variety)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Dendritic agate or included chalcedony (likely tumbled)

Microcrystalline quartz, SiO₂; inclusions likely manganese-oxide dendrites or iron minerals

Polished carnelian agate

Microcrystalline quartz (chalcedony), SiO₂, iron-oxide colored

Chalcedony (Agate Pebble)

Microcrystalline Quartz (SiO2)

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate

Polished carnelian/chalcedony pebble

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled chalcedony or quartz-rich chert

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Jasper

Chalcedony (SiO2)

Tumbled brown agate/chalcedony (probable)

Microcrystalline quartz, SiO₂; likely iron-stained agate or jasper

Tumbled carnelian agate

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

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper

Tumbled amber-colored chalcedony (likely carnelian)

Quartz, microcrystalline SiO₂; orange variety commonly called carnelian

Flower Agate

Silicon Dioxide (SiO2) with Chalcedony inclusions

Polished banded agate pendant

Agate, microcrystalline quartz (SiO₂), a chalcedony variety

Polished agate (likely moss or plume agate)

Microcrystalline quartz (SiO₂), chalcedony variety; exact variety is uncertain from the photo

Gray chalcedony (likely gray agate) bracelet

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Polished jasper pebble

Microcrystalline quartz (chalcedony), usually with iron-oxide impurities