Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Likely milky quartz with iron-oxide inclusions
Quartz, silicon dioxide (SiO₂)
mineral
Granite pebble
Granite; chiefly quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
igneous
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Small rounded pebble, likely quartz-rich stone
Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble
mineral
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Porphyritic Basalt or Spotted Pebble
Porphyritic volcanic rock with phenocrysts
igneous
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Sandstone
Arenite/Quartz Arenite
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Clear Quartz Crystal (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary