Man Made Glass (Not A Natural Rock Or Mineral)

Pink Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (compositionally: Quartz, Feldspar, Mica)

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Quartzite

Quartzite (primarily SiO2)

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion, SiO2

Quartzite Pebble (with Iron Inclusions)

Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2 + impurities)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Red Sandstone

Arenite (Fe2O3 rich)

Agate

Banded Chalcedony (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milk Quartz / Massive Quartz)

Silicon Dioxide (SiO2)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Iron Ore (Limonite and Hematite)

Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)