Microcrystalline Quartz

Polished red jasper

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

Red jasper (likely polished/tumbled)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Red jasper pebble

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

Polished red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored mainly by hematite/goethite

Fancy Jasper (Agate/Chert mix)

Silicon Dioxide (SiO2) with impurities

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

Tumbled red jasper

Jasper, an opaque, iron-bearing variety of microcrystalline quartz (SiO₂)

Polished carnelian agate

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

Jasper

Silicon dioxide (SiO2)

Polished/tumbled brown stone, likely brown jasper or chert

Microcrystalline quartz (SiO₂), probably jasper/chert; exact identification requires testing

Polished brecciated jasper (likely mookaite or similar jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxides

Dyed Agate Slice

Silicon Dioxide (SiO2) - variety of Chalcedony

Black Jasper

Silicon Dioxide (SiO2) with inclusions

Banded Agate

Cryptocrystalline Quartz (SiO2)

Tumbled orange-brown chalcedony or jasper

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony/jasper

Polished/tumbled yellow-brown chert (likely jasper)

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

Iron-stained chert or jasper

Microcrystalline quartz (SiO₂), likely colored by iron oxides/hydroxides

Likely labradorite-bearing pebble; the label also says “carnelian,” but that identification is uncertain

Labradorite, a plagioclase feldspar: approximately (Ca,Na)(Al,Si)₄O₈

Banded chert (jasper-like chert)

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chert

Flint or chert fragment

Microcrystalline quartz (SiO₂), commonly termed chert or flint

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), variably colored by iron oxides

Banded chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly ferruginous shale

Agate

Chalcedony (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Dalmatian Jasper

Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)

Amethyst geode slice

Quartz (SiO₂), purple variety amethyst; commonly a volcanic vesicle geode

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Tumbled brown stone, likely chert or jasper

Microcrystalline quartz (SiO₂), probable chert/jasper

Iron-stained Quartz / Chalcedony Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue-gray chalcedony (likely agate/jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Chert

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Geode

Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock

Jasper

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2 with iron oxide inclusions)

Landscape Jasper

SiO2

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂) colored by hematite/goethite

Gray Agate

Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silica with Hematite impurities), SiO2