Man Made Byproduct (Non Geological)

Agate (specifically, likely a geode slice or nodule)

Agate (a variety of Chalcedony, with chemical formula SiO2)

Porphyritic Basalt (with Lath-like Phenocrysts)

Porphyritic Basalt

Fluorite Tower

Fluorite (Calcium Fluoride - CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Rose Quartz with Feldspar Inclusions

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Scoria

Vesicular Basalt / Scoriaceous Basalt

Black Tourmaline (Schorl)

NaFe3Al6(BO3)3Si6O18(OH)4

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Granite

Phaneritic Felsic Igneous Rock (Granite)

Blue Calcite

Calcium Carbonate (CaCO3)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Gray Quartz (Tumbled)

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (MnSiO3)

Rose Quartz

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

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Quartz

Quartz (SiO₂)

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Smoky Quartz

SiO2 (Silicon Dioxide)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Granite (weathered)

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Limestone

Calcium Carbonate (CaCO3)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Gold and Diamond

Native Gold (Au) and Diamond (C)

Emerald and Diamond (Jewelry Setting)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Glaucophane-bearing Schist (Blueschist)

Blueschist (Glaucophane-Lawsonite Schist)

Diamond (set in Gold)

Diamond (pure carbon, C)

Diamond

Diamond (pure Carbon, C)

Rhodonite

Rhodonite (MnSiO3)

Wallboard/Drywall (Gypsum-based)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Diamond (Cut Specimen)

Carbon (C)

Diamond

Diamond (Pure Carbon, C)