Man Made Glass (Not A Natural Rock Or Mineral)

Sandstone

Arenite (primarily SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert / River Pebble

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock, consisting primarily of Quartz, Feldspar, and Mica)

Sandstone

Arenite (primarily SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Sandstone (Ferruginous)

Arenite (Fe-rich)

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

White Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Sandstone

Arenite

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Smoky variety)

Silicon Dioxide (SiO2)

Granite (Weathered)

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Diamond

C (Carbon)

Diamond

Carbon (C)

Sandstone

Arenite (primarily Quartz, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Hematite Staining

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions

Petoskey Stone

Hexagonaria percarinata

Granite

Granite (Felsic Plutonic Rock)

Diorite (Gneissic)

Diorite

Snowflake Obsidian

Volcanic glass containing Spherulitic Cristobalite (SiO2)

Sandstone

Arenite (primarily SiO2)

Scoria (Lava Rock)

Scoria (vesicular basaltic rock)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)