Man Made Silicate (Anthropogenic Glass)

Quartzite

Quartzite (primarily SiO2)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Quartzite

Quartzite (SiO2)

Ferruginous Quartzite (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebbles (River Stones)

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Granite

Felsic Plutonic Rock (primarily SiO2)

Granite

Phaneritic plutonic rock (Quartz + Feldspar + Mica)

Astrophyllite

Potassium Sodium Iron Manganese Titanium Silicate Hydroxide (K3NaFe7Ti2Si8O24(OH)7)

Corundum

Corundum (Al2O3)

Calcite

Calcite (CaCO3)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Snowflake Obsidian (Flower Jasper variant)

Vitreous volcanic silicate with cristobalite inclusions

Granite

Plutonic felsic igneous rock

Granite

Granite (Felsic Plutonic Rock)

Quartz (Yellow/Citrine variety)

Crystalline Silicon Dioxide (SiO2)

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

River Rock (likely Quartzite or Chert)

Quartzite (primarily SiO2)

Quartzite (Water-worn Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartzite

Quartzite (principally SiO2)

Quartzite

Quartzite (SiO2)

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Yellow Quartzite (Iron-Stained Quartz)

Quartzite (SiO2 with Fe-oxide impurities)

Sandstone (with banding/weathering)

Clastic Sedimentary Rock (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Olivine in Basalt

Peridotite / Forsterite ((Mg,Fe)2SiO4)

Obsidian

Obsidian (volcanic glass), predominantly amorphous SiO₂

Obsidian (specifically Silver Sheen Obsidian)

Volcanic Glass (approx. 70–75% SiO2 plus MgO, Fe3O4)

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)