Granite
Intrusive Igneous Rock
igneous
Category
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Shale
Argillaceous Rock
sedimentary
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz Geode
Crystalline Quartz (SiO2) within a sedimentary/igneous host
mineral
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Porphyry (Porphyritic Basalt / Andesite)
Porphyritic Igneous Rock
igneous
Agate Geode
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)
Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Amygdaloidal Basalt with Quartz Veining
Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Intrusive igneous felsic rock
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Weathered garnet-bearing gneiss
Quartz–feldspar–mica gneiss with almandine garnet, chiefly Fe₃Al₂(SiO₄)₃
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Porphyritic Igneous Rock / Rhyolite Porphyry
Porphyritic volcanic rock
igneous
Sandstone
Arenite
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz Crystals on Clastic Sedimentary Rock
sedimentary
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary