River Stone (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) based metamorphosed sandstone
metamorphic or sedimentary
Category
Man Made Material (Simulated Mineral)
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Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Water-worn basalt cobble
Basalt; chiefly plagioclase feldspar, pyroxene, and minor olivine/iron oxides
igneous
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Diamond
Diamond (C)
mineral
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Polished orbicular granite (likely K2-type granite)
Granite, chiefly quartz, alkali feldspar, plagioclase, and dark amphibole/biotite; possible epidote-rich orbicules
igneous
Slate
Metamorphic Mudstone / Shale
metamorphic
Rose Quartz (carved cutlass pendant)
Silicon Dioxide (SiO2)
gemstone
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia
Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph
metamorphic
Likely weathered quartz-rich stone
Probably quartz-bearing sandstone or milky quartz; exact identification requires testing
mineral
Diamond
C (Carbon)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Weathered brown mineralized rock
Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone (lithic wake or graywacke)
Clastic sedimentary rock (primarily quartz and lithic fragments)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Red Sandstone
Ferruginous Sandstone
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Argillite / Shaly Mudstone
sedimentary
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granodiorite
Granodiorite
igneous
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Felsic Tuff
Pyroclastic volcanic rock (Tuff)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Magnetite-rich iron ore (probable magnetite schist)
Magnetite (Fe₃O₄) in a foliated metamorphic matrix, possibly magnetite–biotite schist
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Diorite
Diorite
igneous
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Polished/patinated jasper slab
Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions
sedimentary
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral