Schist (Biotite/Mica Schist)
Medium-grade regional metamorphic rock (rich in Phyllosilicates)
metamorphic
Category
Sedimentary Or Metamorphic (Base Substrate)
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Mica schist (possibly garnet–mica schist)
Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite
metamorphic
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Manganese staining)
Arenite (composed primarily of SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Purple Dyed Dalmatian Stone
Dyed Peralkaline Trachyte
igneous
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular basalt (likely amygdaloidal basalt)
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone Pebble
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Milky Quartz with Mica
Silicon Dioxide (SiO2) with Muscovite or Biotite inclusions
mineral
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Graywacke with Quartz Vein
Lithic Sandstone (Graywacke)
sedimentary
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Mica Schist
Muscovite-Biotite Schist
metamorphic
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Siltstone
Siltstone (primarily SiO2, Al2O3)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide, SiO2) Geode
sedimentary
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Reddish Brown Claystone or Siltstone
Argillite / Siltstone / Claystone
sedimentary
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Dalmatian Jasper
Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)
igneous
Quartz Vein in Mica Schist
Quartz (SiO2) with Muscovite/Biotite Schist
metamorphic
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primarily)
sedimentary
Limestone Boulder
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary