Mineral (Variety Of Chalcedony)

Chert or chalcedony fragment

Microcrystalline quartz (SiO₂), likely ferruginous chalcedony/jasper

Tumbled honey-brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing

Red Jasper

Jasper (Silicon Dioxide) - SiO2

Jasper (brecciated or orbicular variety)

Silicon dioxide (SiO2) with iron oxide inclusions

Polished brown jasper

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

Tumbled jasper (possibly orbicular jasper)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Yellow Jasper

Silicon Dioxide with Limonite/Goethite inclusions (SiO2)

Tumbled quartz-rich pebble

Quartz (SiO₂), possibly chalcedony or quartzite

Lake Superior Agate

Silicon dioxide (chalcedony variety quartz)

Agate

Silicon dioxide (SiO2) - variety of chalcedony

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Botryoidal chalcedony (likely quartz with iron staining)

Chalcedony, cryptocrystalline SiO₂; possible quartz druse and limonite/goethite inclusions

Banded Jasper / Yellow Jasper with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with iron oxide and silicate impurities

Polished agate (likely)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Tumbled brown quartz/chalcedony (probable)

Quartz, SiO₂; possibly brown chalcedony or jasper

Tumbled chalcedony (likely yellow/brown agate or carnelian)

Microcrystalline quartz, SiO₂; chalcedony with possible iron-oxide staining

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay-mineral inclusions

Agate (Carnelian Agate with Quartz Matrix)

Silicon Dioxide (SiO2)

Jasper Beads (Polished)

Silicon Dioxide (SiO2)

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2)

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Agate Nodule / Chalcedony

Silicon Dioxide (SiO2)

Likely polished agate or chalcedony pebble

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

Agate

SiO2

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Carnelian (Chalcedony variety)

SiO2 (Silicon Dioxide)

Chalcedony (Quartz variety)

Silicon Dioxide (SiO2)

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Tumbled agate or chalcedony

Microcrystalline quartz, SiO₂

Polished yellow-orange chalcedony (likely carnelian)

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

Blue lace agate (likely dyed or color-enhanced)

Microcrystalline quartz (chalcedony), SiO₂

Gray Agate

Chalcedony (Silicon Dioxide, SiO2)

Tumbled Agate

Silicon Dioxide (SiO2)

Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)

Calcium Carbonate (CaCO3)

Ocean Jasper

Spherulitic Chalcedony (SiO2 with impurities)

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Tumbled purple agate (likely amethyst-bearing agate)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image