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

Tumbled chalcedony (likely agate or jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Banded Jasper

Silicate Mineral (Microcrystalline Quartz / SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Yellow Agate

Silicon Dioxide (Chalcedony variety), SiO2

Light-colored agate (likely chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Chert (Jasper variety)

Chert (SiO2)

Tumbled brown jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Tumbled jasper (likely brecciated or red jasper)

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

Polished blue-gray agate/geode slice (tentative)

Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties

Polished chrysoprase (likely)

Chalcedony, microcrystalline quartz (SiO₂), colored by nickel-bearing minerals

Jasper

Silicon dioxide (SiO2) with impurities

Chert (specifically Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

SiO2 (Silicon Dioxide)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Tumbled jasper

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

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), likely brown jasper/chalcedony

Tumbled jasper or chalcedony

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

Red Jasper

Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Tumbled jasper (likely brecciated or ocean jasper)

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

Tumbled white chalcedony (likely milky quartz)

Chalcedony, cryptocrystalline SiO₂; possibly common quartz or white agate

Picture Jasper

SiO2, Microcrystalline Quartz

Red jasper (possible polished or dyed stone)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and pale chalcedony/quartz veins

Carnelian

Orange chalcedony, microcrystalline quartz (SiO₂)

Red jasper (likely tumbled)

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

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing hematite, goethite, and clay minerals

Polished multicolored jasper

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

Agate Nodule

Silicon dioxide (Chalcedony/Quartz), SiO2

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Small tumbled quartz pebble, possibly chalcedony

Quartz (SiO₂), likely microcrystalline chalcedony

Chert (or Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

Blue Chalcedony

Silicon Dioxide (SiO2)