Mica Schist
Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Chert / Pink Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony (Common Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Schist
Mica Schist
metamorphic
Chert (variously Flints)
Microcrystalline Quartz (SiO2)
sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint when dark or worked)
Cryptocrystalline silica (SiO2)
sedimentary
Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Concrete
Hydrated Portland Cement Aggregate Composite
Anthropogenic Sedimentary (Man-made)
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Diorite
Diorite
igneous
Diamond
C
gemstone
Tumbled carnelian agate
Cryptocrystalline quartz (SiO₂), chalcedony variety with iron-oxide coloration
gemstone
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Pumice
Pumicite
igneous
Sandstone (Quartzose)
Arenite (Formula: SiO2 primary, with various cements)
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Quartz / River Cobble
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Sandstone (likely Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Greenstone / Greenschist
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Chert (specifically Red Chert/Jasper nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (primarily Pyroxene and Plagioclase)
igneous
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Rough Diamond
Diamond (Native Carbon), C
mineral
Sandstone Pebble
Arenite
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Red Sandstone
Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)
sedimentary