Synthetic (Not A Rock Or Mineral)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Quartz (Milky/Yellowish variety)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

K2 Azurite Granite / K2 Stone

Granite (igneous rock) with Azurite inclusions (mineral)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Basalt with vesicles (Amygdaloidal Basalt)

Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (often composed of Quartz, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Vesicular Basalt with Lichen

Vesicular Basalt

Sandstone

Arenite (SiO2 based with quartz grains)

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Sandstone

Arenite (SiO2 based)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Fe2O3 cement)

Sandstone

Arenite (Clastic Sedimentary Rock)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Iron-stained Quartz (Gossan/Limonite-coated Quartz)

Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe2O3 staining)

Green Slag Glass (Cullet)

Amorphous Silica (Industrial Glass Byproduct)

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Amygdaloidal Basalt

Amygdaloidal Basalt

Moonstone

Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)

Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

White Marble

Recrystallized Calcite (CaCO3)

Banded Gneiss

Gneiss

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)