Not A Natural Rock (Man Made Composite)

Granite

Phaneritic Felsic Intrusive Rock (Granite)

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite (specifically Pink Granite)

Phaneritic Plutonic Rock (High Potassium Feldspar Granite)

Smoky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

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

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Wonderstone (Sandstone)

Liesegang Banded Sandstone (SiO2 dominated)

River Rock (Basalt/Greywacke)

Aphanitic Basalt or Lithic Sandstone (Greywacke)

Herkimer Diamond

Quartz (SiO2)

Granite

Granite (silica-rich intrusive igneous rock)

Clear Quartz

SiO2 (Silicon Dioxide)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

Diorite (Spotted or Dalmatian Stone effect)

Diorite (Intermediate Plutonic Rock)

Slate

Slate (Foliated Metamorphic Rock)

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - stained microcrystalline quartz

Green Aventurine and Clear Quartz

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

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Basalt

Basalt (Mafic Aphanitic Igneous Rock)

Gold Nugget

Native Gold (Au)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (volcanic glass)

Clear Quartz

Silicon Dioxide (SiO2)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial colorants

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Druzy Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Pumice

Pumice (volcanic glass with vesicular texture)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)