Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Fluorite

Calcium Fluoride (CaF2)

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Rhodonite with Manganese Oxides

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Serpentine (Serpentinite)

Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4

Chert (Tan/Buff Chert)

Microcrystalline Quartz (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

Gold Nugget

Native Gold (Au)

Quartzite

Quartzite (SiO2)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Olivine (Peridot in gem form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Black Onyx

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)

Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Chert (Nodule)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Moss Agate

Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Siderite Concretion (Nodule)

Iron Carbonate (FeCO3) Concretion

Basalt

Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Quartzite

Quartzite (SiO2)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Greywacke

Dirty Sandstone (Lithic wacke)

Fossiliferous Limestone

Calcium Carbonate - CaCO3

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Scoria

Vesicular Basaltic Andesite/Scoria

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Chert (Flint)

Silicon Dioxide (SiO2)