Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Category
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Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Quartz (Crystal Cluster)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy or Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Agate
Silicon dioxide (SiO2)
mineral
Blue Lace Agate
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Gold Nugget Jewelry
Native Gold (Au)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Eudialyte in Matrix
Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Azurite in Matrix
Azurite (Cu3(CO3)2(OH)2) in Rhyolite or Sandstone matrix
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Limonitic Sandstone (Stained Sandstone)
Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Garnet in Schist (Garnetiferous Micaceous Schist)
Almandine Garnet, Fe3Al2(SiO4)3
metamorphic
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Granite
Phaneritic plutonic rock (SiO2 + Al2O3)
igneous
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Kimberlite
Kimberlite
igneous
Pyrite in Matrix (Quartz/Schist)
Iron Sulfide (FeS2)
mineral
Moonstone
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral