Microcrystalline Quartz

Jasper Pebble

Microcrystalline Quartz (SiO2)

Agate

Cryptocrystalline Quartz (SiO2)

Carnelian

SiO2 (Silicon Dioxide) with Ferric Oxide inclusions

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Banded Agate

Agate (Silicon Dioxide, SiO2)

Tumbled brown jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert

Dalmatian jasper (likely orbicular rhyolite)

Silica-rich rhyolite, commonly sold as Dalmatian jasper; typically quartz, feldspar, and dark amphibole/biotite inclusions

Polished jasper slab

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

Brown chalcedony/agatic jasper nodule

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony with included or weathered host material

Polished jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other impurities

Tumbled red jasper

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

Chalcedony (Common Opal or Agate variant)

Silicon dioxide (SiO2) with trace hydration

Weathered iron-rich chert or jasper

Microcrystalline quartz (SiO₂), variably stained by iron oxides such as hematite and goethite

Gray flint or chert fragment

Microcrystalline quartz (SiO₂), likely chert/flint

Polished red jasper pebble

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

Tumbled dark brown stone, likely jasper or iron-rich chert

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

Chert

Chert (SiO2)

Tumbled brown stone, likely jasper or chert

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

Banded Agate (Lake Superior Agate / Sardonyx)

Silicon Dioxide (SiO2)

Chert (Flint/Nodule)

Silicon Dioxide (SiO2)

Weathered jasper/chert nodule

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

Yellow jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Tumbled brown jasper

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

Red jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Tumbled green agate (likely moss or chalcedony agate)

Cryptocrystalline quartz, SiO₂; likely green chalcedony with possible chlorite or iron inclusions

Tumbled jasper/chert pebble

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

Red jasper pebble

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

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Tumbled jasper or weathered chert

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

Tumbled brown jasper

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

Tumbled red jasper

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

Tumbled jasper pebble

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

Yellow Chalcedony (Quartz Pebble)

Silicon Dioxide (SiO2)

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other silicate inclusions

Polished carnelian

Carnelian, orange-red cryptocrystalline quartz (SiO₂), chalcedony variety

Polished red jasper

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

Tumbled green jasper (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities

Red jasper fragment

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

Fossilized Coral

Cnidaria fossil / Calcite-replaced coral

Flint / Chert

Silicon dioxide (SiO2)

Jasper Agate (Chalcedony)

Silicon Dioxide (SiO2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)