Gold-Bearing Quartz
Silicon Dioxide with Native Gold (SiO2 + Au)
mineral
Category
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Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Limonite / Ironstone Concretion
Hydrated Iron Oxide (FeO(OH)%C2%B7nH2O)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Desert Rose (Baryte/Gypsum)
Barium sulfate (BaSO4) or Hydrated calcium sulfate (CaSO4·2H2O)
mineral
Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
sedimentary
Weathered granite or granodiorite fragment
Granite–granodiorite, chiefly quartz, feldspar, and dark biotite/amphibole
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Peridotite
Ultramafic intrusive igneous rock
igneous
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss
Gneiss
metamorphic
Quartz Vein / Quartzite
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Amygdaloidal Basalt
Vesicular Basalt with Amygdules
igneous
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone Concretion
Septarian Concretion (Nodule)
sedimentary
Granite (likely weathered quartz-bearing granite)
Granite; primarily quartz, feldspar, and mica/amphibole
igneous
Vesicular basalt (possibly amygdaloidal basalt)
Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine and secondary mineral infillings
igneous
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)
igneous