Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Category
Biogenic Material
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Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2)
igneous
Conglomerate
Polymictic Conglomerate
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
K(AlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz and Feldspar)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
metamorphic
Schist
Schist
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper River Stone
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
sedimentary
Siltstone
Siltstone (primarily composed of SiO2 with various clay minerals)
sedimentary
Granitic Gravel
Granite (Quartz, Feldspar, and Mica mixture)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Quartz (White Pebble) and Sandstone (Brown/Tan Fragments)
Silicon Dioxide (SiO2) for the white pebble
mineral and sedimentary
Coquina
Bioclastic Limestone
sedimentary
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
sedimentary
Arfvedsonite with Garnet
Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2
igneous