Synthetic Material (Not A Rock Or Mineral)

Diorite

Intrusive Igneous Rock (Intermediate Composition)

Weathered granite pebble

Granitic rock, chiefly quartz, potassium feldspar, plagioclase, and mica/hornblende

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Granite

Granite (Phaneritic intrusive igneous rock)

Polished Picasso jasper

Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Diamond (Faceted)

Carbon (C)

Septarian Nodule (Galt)

Calcareous concretion / Septarian concretion

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Rounded granitic pebble

Granite, likely biotite granite or granodiorite

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Jasper Conglomerate

Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)

Quartzite with Quartz Veins

Metamorphic Quartz-rich Rock (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Anthracite Coal

Anthracite (Carbon ≥ 86%)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Quartz-rich pegmatitic rock, possibly rose quartz with mica

Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Sandstone (Ferruginous)

Arenite with Iron Oxide (Fe2O3) cement

Unakite (likely epidote–feldspar rock)

Epidote–K-feldspar–quartz aggregate; commonly approximated as pink orthoclase/microcline + green epidote + quartz

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Shale with Trace Fossils

Fissile mudrock (Shale)

Granite

Granite (Phaneritic Igneous Rock)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Granite (with Quartz fragment)

Intrusive Felsic Igneous Rock

Yellow Sapphire

Corundum (Al2O3:Fe)

Diorite (Dalmatian Stone)

Intermediate Phaneritic Igneous Rock

Brown chalcedony (likely carnelian/iron-stained quartz)

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

Weathered iron-rich rock, likely limonite-bearing sandstone or laterite

Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)