Sedimentary (Microcrystalline Silicate)

Green Jasper (Agate-Jasper mixture)

Silicon Dioxide (SiO2) with impurities

Polished rainbow jasper (likely ocean/imperial jasper)

Microcrystalline quartz (SiO₂) with iron oxides and varied silicate inclusions

Weathered limestone pebble

Microcrystalline calcite (CaCO₃), possibly fossiliferous limestone

Chert (Jasper)

Silicon Dioxide (SiO2)

Banded Jasper / Yellow Jasper with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with iron oxide and silicate impurities

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Leopard skin jasper (orbicular jasper)

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

Jasper (Multi-color Chert)

Silicon dioxide (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Shiva Lingam

Cryptocrystalline Quartz (Jasper/Chalcedony) with Iron Oxide inclusions

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Seashell Fossil

Mollusca fossil

Chert (Jasper)

Silicon Dioxide (SiO2)

Tumbled pale limestone or calcite-rich stone

Limestone, chiefly calcite (CaCO₃); exact identification is uncertain from the photograph

Snakeskin Agate

Agate (Cryptocrystalline Quartz, SiO2)

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Nephrite Jade / Epidote Pebble

Ca2(Mg,Fe)5Si8O22(OH)2 / Ca2Al2Fe3+(SiO4)(Si2O7)O(OH)

Jasper

Jasper (Silicon Dioxide, SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with impurities

River Stone (River Pebble)

River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay inclusions

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

Jasper

Silicon dioxide (SiO2) with impurities

Likely polished dark stone (identity uncertain)

Undetermined; possibly polished basalt, chert, or another dark silicate rock

Quartz pebble

Silicon dioxide (SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Jasper (Red/Yellow)

Silicon Dioxide (SiO2) with impurities

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Tumbled jasper, likely ocean or brecciated jasper

Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities

Likely weathered gray stone or chert fragment

Uncertain; possibly microcrystalline quartz (SiO₂)-rich chert

Rounded brown pebble, likely weathered basalt or iron-rich chert

Indeterminate; possibly basalt (fine-grained mafic silicate rock) or ferruginous chert

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Ocean Jasper

Orbicular Jasper / Silicate

Chert (or Fossiliferous Limestone)

Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)