Microcrystalline Quartz

Red Jasper (Polished Point Pendant)

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Quartz Pebble (Chert/Chalcedony Gravel)

Microcrystalline Quartz (SiO2)

Quartzite (or Chert/Flint gravel)

Quartzite (SiO2 with iron oxide inclusions)

Polished orbicular jasper

Microcrystalline quartz (SiO₂) with iron-rich and altered volcanic inclusions

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Brown chalcedony (agate-like flint/chert fragment)

Chalcedony, microcrystalline quartz (SiO₂); identification is tentative from the photo

Green Chert

Microcrystalline Quartz (SiO2)

Carnelian

Silicon Dioxide (Chalcedony variety, SiO2)

Dalmatian Jasper

Dalmatian Stone (Aplite with Arfvedsonite)

Chert / Flint

Silicon Dioxide (SiO2)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Geode

Silicon dioxide (Quartz/Chalcedony nodule)

Beaded stone necklace, likely yellow agate or chalcedony

Chalcedony (microcrystalline quartz, SiO₂); exact stone cannot be confirmed from the photo

Yellow jasper (likely polished/tumbled)

Microcrystalline quartz, SiO₂, colored by iron oxides; exact identification is uncertain from the image

Polished red jasper pendant

Jasper, an opaque, microcrystalline variety of quartz (SiO₂), colored red by iron oxides

Jasper (likely brecciated or chalcedony-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Tumbled quartz-rich pebble

Likely quartz-bearing chert or jasper; primarily microcrystalline SiO₂

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert

Grape Agate

Silicon Dioxide (SiO2)

Carnelian

Silicon dioxide (Chalcedony), SiO2

Agate

SiO2

Blue Lace Agate

Silicon dioxide (SiO2) with trace inclusions

Carnelian Agate

Silicon Dioxide (Chalcedony variety)

Leopard Skin Jasper

Microcrystalline Quartz (SiO2) with mineral impurities

Agate pebble (with blue chalcedony exposure)

Silicon Dioxide (SiO2)

Polished brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining

Iron-stained river pebble (likely jasper or chert)

Silica-rich microcrystalline quartz, SiO₂, colored by iron oxides; exact identification is uncertain from the image

Small polished jasper or agate pebble

Likely microcrystalline quartz (SiO₂); exact variety cannot be determined from the photo

Agate Nodule

Silicon Dioxide (SiO2)

Polished green jasper/chert pebbles (likely)

Microcrystalline quartz, SiO₂; varieties may include jasper or chert

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Tumbled chalcedony (likely jasper/chert variety)

Microcrystalline quartz, SiO₂ (chalcedony; opaque varieties commonly called jasper or chert)

Iron-rich chert or jasper

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

Polished red jasper and carnelian-like stones

Jasper: microcrystalline quartz (SiO₂), commonly colored by iron oxides; translucent piece may be carnelian, a chalcedony variety

Orange-red jasper pebble

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

Chalcedony (Tumbled Agate/Jasper)

Silicon dioxide (SiO2)

Banded chert or jasper pebble

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

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled jasper/chert pebble

Microcrystalline quartz (SiO₂), likely jasper or silicified chert

Rounded quartz-rich pebble

Likely microcrystalline quartz (chalcedony), possibly weathered quartzite

Jasper Pebble

SiO2 (Microcrystalline Quartz)