Man Made Object (Metalwork)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Granite

Granite (a phaneritic intrusive igneous rock)

Granite

Phaneritic Felsic Igneous Rock

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Granite

Granite (Silicic Intrusive Igneous Rock)

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chert (Yellow/Tan variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Banded Chert

Microcrystalline Quartz (SiO2)

Rhodonite

Manganese Silicate (Mn, Fe, Mg, Ca)SiO3

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Diorite (Gneissic)

Diorite

Pearl

Aragonite (CaCO3) with Conchiolin

Spondylus Oyster Calcification / Fossilized Oyster

Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)

White Jade (Nephrite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Diabase (Greenstone)

Diabase (Dolerite)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

Arenite (composed primarily of SiO2)

Turquoise

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

Rose Quartz

Silicon Dioxide (SiO2)

Rose Quartz

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

Black Onyx

Silicon dioxide (SiO2) - Chalcedony variety