Chert / River Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Or Mineral
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Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Ironstone Concretion / Limonite
Goethite and Limonite (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron impurities
sedimentary
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (predominantly SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Sandstone (likely Quartzose type)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Iceland Spar (Optical Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Red Sandstone
Arenite with Iron Oxide (Hematite) cement
sedimentary
Red Sandstone
Arenite (with Iron Oxide pigmentation)
Sedimentary
Botryoidal Chalcedony Geode
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a Sedimentary Vug
sedimentary
Sandstone (Pet Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Sandstone (Stream-Rolled)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Glacial Granite with Epidote
Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Sandstone (Pebble)
Sandstone (composed mainly of Quartz, SiO2, with feldspar and lithic fragments)
sedimentary
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Mica Schist
Mica Schist (Quartz-Mica Schist)
metamorphic
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary