Synthetic (Not A Natural Rock)

Smoky Quartz

SiO2 (Silicon Dioxide)

Pink Granite

Phaneritic intrusive felsic igneous rock

Granite

Granite (compositional mixture of Quartz, Feldspar, and Mica)

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Red Sandstone

Arenite (with Iron Oxide)

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Blue Lace Agate

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Turquoise

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

Granite

Phaneritic plutonic rock (primarily Quartz, Alkali Feldspar, and Plagioclase)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Slate

Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Turquoise

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

Chert Nodule (with Ironstone Cortex)

Microcrystalline Silica (SiO2)

Turquoise

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

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Oxide impurities

Granite

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

Granite

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

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Black Onyx

Silicon Dioxide (SiO2) with cryptocrystalline structure

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Quartzite

Quartzite (primarily SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Granite

Granite (Mainly Quartz, Feldspar, and Mica)