Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
metamorphic
Category
Organic Structure (Not A Rock)
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Schist
Schist
Metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Pink Opal / Peruvian Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
Mineral
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Basalt with Amygdales
Amygdaloidal Basalt
igneous
Basalt with Quartz/Calcite Veins
Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Granite
Granite
Igneous
Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (variously known as Flint or Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Mexican Cantera Opal
Amorphous hydrated silica (SiO2·nH2O) in Rhyolitic host rock
gemstone
Basalt with Quartz Vein
Basaltic rock with hydrothermal SiO2 filling
igneous
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Chert (Flint/Novaculite)
Microcrystalline Quartz (SiO2)
sedimentary
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Sandstone
Arenite
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Serpentinite
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with CaCO3 veins
igneous
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Fossil Coral in Limestone
Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite
fossil
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Fuchsite in Quartz
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz (SiO2)
metamorphic
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary