Man Made Glass (Not A Natural Rock Or Mineral)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Sandstone

Arenite (SiO2 based clastic rock)

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Ferruginous Quartz

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

Clear Quartz

Silicon Dioxide (SiO2)

Shale

Fissile Siliciclastic Sedimentary Rock

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Sandstone (Pebble)

Arenite (composed primarily of SiO2)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Sandstone

Arenite

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Smoky Quartz on Matrix

Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions

Granite

Phaneritic Felsic Igneous Rock

Herkimer Diamond (Quartz)

Silicon Dioxide (SiO2)

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Blue Sapphire (likely costume glass imitation)

Corundum (Al2O3) with iron/titanium impurities

Herkimer Diamond (Quartz Crystal)

Silicon Dioxide (SiO2)

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Jasper

Silicon dioxide / Chalcedony (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)

Native Silver

Silver (elemental Ag)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Yellow Quartz / Citrine Quartz

Silicon Dioxide (SiO2)