Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
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Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone
Arenite
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
Sedimentary
Gneiss (Pebble)
Gneiss
metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Shale
Lutaceous sedimentary rock
sedimentary
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Not a rock
Not a rock
Not a rock
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary