Not A Natural Rock

Silty Shale

Silty Shale (Fissile Sedimentary Rock)

Granite

Granite (phaneritic felsic intrusive rock)

Sandstone

Arenite (SiO2 primarily)

Conglomerate

Conglomerate (clastic sedimentary rock)

River Rock (Basalt/Greywacke)

Aphanitic Basalt or Lithic Sandstone (Greywacke)

Clear Quartz

Silicon dioxide (SiO2)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Rough Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Granite

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Yellow Quartz (Citrine or Yellow Jasper)

Silicon Dioxide (SiO2)

Scoria (Lava Rock)

Scoria (vesicular basaltic rock)

Diorite

Diorite (Intermediate intrusive igneous rock)

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Granite

Granite (Phaneritic Acid Igneous Rock)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Scoria (Lava Rock)

Scoria (Mafic Volcanic Rock)

Shale

Shale (Consolidated fine-grained clay/silt)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - stained microcrystalline quartz

Smoky Quartz in Matrix

Silicon dioxide (SiO2) within Pegmatite/Gneiss

Pink Granite

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Scoria (Red Lava Rock)

Scoria (Vesicular basaltic rock)

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Granite

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Basalt (River Pebble)

Extrusive Mafic Igneous Rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions