Synthetic (Not A Natural Rock)

Polished pink banded agate

Microcrystalline quartz (chalcedony), SiO₂

Sunstone

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

Weathered iron-rich rock, possibly laterite or limonite-bearing stone

Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing

Pink Granite

Granite (Alkali-feldspar granite)

Polished Tumbled Fluorite (or Dark Amethyst)

CaF2 (Calcium Fluoride) / SiO2 (Silicon Dioxide)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Gold Nugget

Native Gold (Au)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Brown chalcedony (likely carnelian/iron-stained quartz)

Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides

Granite

Granite (Phaneritic Quartz-Feldspar-Mica Rock)

Lapis Lazuli

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

Weathered pink granite fragment

Granite, chiefly quartz, potassium feldspar, and plagioclase feldspar with minor mica

Polished orbicular granite (likely larvikite or orbicular diorite)

Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing

Turquoise

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

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Black Onyx

Silicon Dioxide (SiO2) - variety of Chalcedony

Turquoise

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

Turquoise

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

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

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.

Vesicular basalt (likely weathered lava rock)

Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine

Granite

Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Mottled gabbro or diorite pebble

Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite

Greywacke Siltstone Pebble / Concretionary River Pebble

Siltstone / Argillite (Fine-grained Sedimentary Rock)

Quartzite

Quartzite (composed primarily of Quartz, SiO2)

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Rounded basalt cobble

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine and iron oxides

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Granite

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

Granite

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

Iron-rich botryoidal limonite/goethite specimen

Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Turquoise

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