Organic Mineral

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Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Iron Meteorite (Individual)

Siderite (composed of Kamacite and Taenite minerals)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Ammonite Fossil (Polished Section)

Ammonoidea (typically mineralized with Calcite CaCO3)

Granite (including Pegmatite variants)

Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Greenschist (Greenstone)

Greenschist

Dinosaur Bone (Fossilized)

Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)

Labradorite

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Sandstone

Arenite (predominantly SiO2)

Quartz with Hematite Staining

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions

Diamond

Carbon (C)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Diamond

Diamond (C)

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone

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

Green Aventurine

Aventurine (variety of Quartz - SiO2)

Granite

Phaneritic Felsic Igneous Rock (Main minerals: SiO2, KAlSi3O8, NaAlSi3O8)

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Fluorite

Calcium Fluoride (CaF2)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Schist

Crystalline Metamorphic Rock (Schistose)

Howlite and Purpurite druzy

Calcium Borosilicate Hydroxide (Howlite) and Manganese Phosphate (Purpurite)

Tumbled Moonstone

Feldspar (Orthoclase/Albite), KAlSi3O8

Turquoise

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

Quartz Geode

Silicon Dioxide (SiO2)

Satin Spar (often sold as Selenite)

Gypsum (CaSO4·2H2O)

Sandstone

Arenite (SiO2 primarily)

Aquamarine

Beryl (Be3Al2Si6O18)

Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Amethyst (Polished/Carved Crystal)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)