Sedimentary Or Igneous (Host Environment)

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (pebble)

Quartz (SiO₂)

Quartz / Common Gravel

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (SiO2 principal)

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Granite

Granite

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Chert (Tan/Yellow variety)

Microcrystalline Quartz (SiO2)

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Turritella Agate (Calligrapher Stone)

Silicified Elimia tenera (Chalcedony/Quartz)

Chert (Jasper/Quartzite)

Microcrystalline Silicon Dioxide (SiO2)

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Basalt (River Pebble)

Basalt (Aphanitic Mafic Volcanic Rock)

Gossan with Copper Carbonate (Chrysocolla/Malachite)

Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Yellow Chert or Jasper

Silicon Dioxide (SiO2)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Chert (Common Opal/Agate inclusion)

Microcrystalline Quartz (SiO2)

Yellow Chert (River Stone/Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Pebble

Clast (specifically a granule or small pebble)

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Chert (Jasper-bearing)

Microcrystalline silica (SiO2) with iron oxide inclusions

Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide (Fe2O3) cement

Basalt (Vesicular)

Basalt (Extrusive Volcanic Rock)

Fossiliferous Limestone with Crinoid stems

Calcite-rich Biogenic Sedimentary Rock (CaCO3)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)