This Is Not A Rock Or Mineral

Turquoise and Red Coral

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

River Rocks (Black)

Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Sandstone (River Pebble)

Arenite (SiO2 based)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Red Sandstone

Arenite (Ferruginous Sandstone)

Black Veined Jasper (Spiderweb Jasper)

Silicon Dioxide (SiO2)

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Granite

Granitic intrusive igneous rock

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Fire Agate

Silicon Dioxide (SiO2) with layered Iron Oxide (Limonite/Goethite)

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Turquoise

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

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz (Carved Dragon)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Agate

Silicon dioxide (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Granite

Phaneritic Felsic Intrusive Rock (Granite)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Rock)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Fire Agate

Chalcedony (Silicon Dioxide, SiO2) with Limonite/Goethite

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Diabase (Greenstone)

Diabase (also known as Dolerite)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)