Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock
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Sandstone (Red)
Arenite (composed primarily of SiO2)
sedimentary
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
River Rock (Greywacke/Siltstone)
Siltstone / Argillaceous Greywacke
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
River Stone (Greywacke)
Greywacke (Lithic Sandstone)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Porphyritic Andesite
Andesite with Hornblende phenocrysts
igneous
Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Conglomerate
Conglomeratic Sandstone
sedimentary
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Granodiorite with Biotite Mica
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite Mica)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Rock
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Druzy Quartz Geode (Vug)
Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz Vein in Mafic Rock
Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)
metamorphic
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (or potentially Jasper/Chalcedony)
SiO2 (Silicon Dioxide)
sedimentary
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary