Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Snakeskin Jasper

Microcrystalline Quartz (SiO2) with iron inclusions

Mookaite Jasper

Radiolarite (SiO2)

Mineral and Rock Collection (Assorted)

Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine

Agate

Silicon Dioxide (SiO2)

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (SiO2 with impurities)

Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)

Quartz variety (SiO2) / Polycrystalline Quartz Aggregate

Amygdaloidal Basalt

Extrusive Igneous Rock with Secondary Mineral Fillings

Sandstone and Gravel Aggregate

Clastic Sedimentary Rock / Quartzose Sandstone

Breciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

River Pebble (Sandstone)

Quartz-rich Sandstone Pebble

Polished Black Obsidian

Volcanic Glass (70-75% SiO2)

Quartz Geode with Chalcedony

Silicon Dioxide (SiO2) in Geode Form

Polished jasper pebble

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

Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)

Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates

Chert (Limestone/Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Red Jasper with Quartz Veining

Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Quartz Sand/Gravel

Silicon Dioxide (SiO2)

Yellow Quartz / Chalcedony Pebble

Silicon Dioxide (SiO2)

Likely anthracite coal fragments

Anthracite; predominantly carbon (C), with minor mineral ash

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) with varying mineral impurities

Carnelian (Agate)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2)

Dark tumbled stone, likely basalt or black chert

Probable basalt (fine-grained plagioclase–pyroxene rock); chert is an alternative

Likely weathered granite or granitic gneiss fragments

Granite: quartz–feldspar–mica aggregate; possibly biotite granite or weakly foliated gneiss

Chert (also known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Weathered)

Chert (Microcrystalline Quartz, SiO2)

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

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

Agate

Chalcedony (SiO2)

Tumbled jasper or iron-rich chert

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

Kambaba Jasper

Rhyolite (with Stromatolite fossil inclusions)

Sandstone Pebble

Sandstone (Silicon dioxide-rich clastic sedimentary rock)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock pebble

Quartz pebble (Agate / Chalcedony)

Silicon Dioxide (SiO2)

Dyed Dalmatian Stone (Dalmatian Jasper)

Aplite (predominantly quartz, feldspar, and arfvedsonite)

Chalcedony / Agate Pebble

Silicon Dioxide (SiO2)

Chert (River Cobble)

Chert (Cryptocrystalline Quartz, SiO2)

Quartz-veined Limestone

Sedimentary limestone with quartz/calcite veinlets

Jasper

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Chert with Quartz Veins

Microcrystalline Quartz (SiO2)