Basalt
Aphanitic Mafic Igneous Rock
igneous
Category
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Shale
Shale (Fine-grained clastic sedimentary rock)
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Shale
Lutaceous sedimentary rock
sedimentary
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica
igneous
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary
Gneiss
Gneiss
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Greenstone
Protolith: Basaltic rock
metamorphic
Schist
Schist
metamorphic
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz pebble with calcite
Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)
Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image
mineral
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Hag Stone (Adder Stone / Geode-bearing Pebble)
Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Granite
Intrusive Igneous Rock
igneous
Basalt with Amygdales
Amygdaloidal Basalt
igneous
Weathered iron-rich rock, likely limonite/goethite-bearing laterite
Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
mineral
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous