Microcrystalline Quartz

Dalmatian Stone

Dalmatian Stone (Felsic Igneous Rock)

Flint (or Chert with cortex)

Silicon dioxide (SiO2)

Agate (Sliced Nodule)

Silicon Dioxide (SiO2) - Chalcedony variety

Polished brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Likely brown jasper or iron-stained chert

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Polished banded jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Banded chert or flint pebble

Microcrystalline quartz (chalcedony), SiO₂

Polished brecciated jasper (likely Apache tear–type iron-rich jasper)

Jasper, microcrystalline quartz (SiO₂), colored by hematite/goethite and other iron oxides

Tumbled red jasper

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

Banded agate/chalcedony fragment

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Polished red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Polished brecciated jasper (likely Picasso jasper)

Brecciated microcrystalline quartz/chalcedony; mainly SiO₂ with iron- and manganese-rich matrix

Polished brecciated jasper bracelet

Jasper, microcrystalline quartz (SiO₂), commonly with hematite and iron-oxide inclusions

Tumbled brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chert/jasper

Tumbled red jasper

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

Tumbled jasper (likely brecciated or ocean jasper)

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

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled reddish jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Banded Agate

Silicon dioxide (SiO2)

Yellow Calcite / Banded Onyx Calcite

Calcite (CaCO3)

Tumbled red jasper

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

Red jasper pebble

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

Red jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Red jasper pebble

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

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Dalmatian Jasper (Dalmatian Stone)

Perthitic feldspar with Arfvedsonite inclusions

Tumbled yellow chalcedony or jasper pebble

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

Likely weathered flint or chert fragment

Cryptocrystalline quartz (SiO₂), possibly siliceous chert/flint

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Likely iron-stained chert or chalcedony pebble

Microcrystalline quartz (SiO₂), possibly ferruginous chert

Tumbled brown-and-cream stone, likely jasper or chert

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

Blue cabochon, likely dyed or synthetic material

Undetermined; possibly dyed chalcedony (SiO₂), glass, or synthetic corundum

Likely carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); carnelian is its iron-colored variety

Iron-rich jasper/chert nodule

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite

Tumbled amber-colored pebble

Likely quartz/chert or iron-stained chalcedony; exact identification requires testing

Tumbled orange chalcedony (probable carnelian)

Cryptocrystalline quartz, SiO₂; reddish-orange variety commonly called carnelian

Tumbled blue chalcedony (likely blue lace agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly banded blue lace agate

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-bearing jasper

Banded Agate (Brazilian Agate Slice)

Chalcedony (Silicon Dioxide / SiO2)

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂)

Chert (Siliceous Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Banded Chert / Jasper

Silicon Dioxide (SiO2)