Chert (varieties: Flint or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
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Chert (specifically Flint or Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (with Lichen)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (with banding)
Arenite (primarily SiO2)
sedimentary
Breccia
Clastic Breccia
sedimentary
Mica Schist
Muscovite/Biotite Schist
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Chert Arrowhead and Quartz Specimen
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Agate/Jasper mix)
Silicon Dioxide (SiO2)
mineral
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite
igneous
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Schist
Schist (primarily mica-schist)
metamorphic
Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Muscovite Mica (Granitic Pegmatite)
Muscovite - KAl2(AlSi3O10)(OH)2
igneous
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Sea Glass
Amorphous silicon dioxide (Man-made glass weathered by nature)
mineral
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Tektite
Tektite (Natural Glassy Ejecta)
mineral
River Cobble (Mixed Lithology)
Clastic Sedimentary Rock (Silicified Siltstone or Wacke)
sedimentary
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
River Cobble (Sandstone)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Sandstone
Arenite
sedimentary
Basalt Breccia
Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Blue Topaz
Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2
gemstone
Diorite or Granodiorite Pebble
Intermediate Phaneritic Igneous Rock
igneous
Pegmatite (with Muscovite Mica and Quartz)
Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous