Sedimentary Or Metamorphic Derived

Jasper

Silicon dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Rhodonite

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

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Mica Schist

Schist (Crystalline metamorphic rock)

Red Jasper (possibly Brecciated)

Jasper (Silicon Dioxide, SiO2)

Mixed stream gravel and common rock specimens

Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image

Rounded quartz-rich pebble

Likely milky quartz or quartzite (SiO₂)

Unakite

Unakite (metamorphosed granitic rock)

Unakite

Altered Granite (Epidote, Orthoclase Feldspar, Quartz)

Marble

Metamorphic Limestone (CaCO3)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Rhodonite Tumbled Chips

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

Hypersthene

Hypersthene (Enstatite variety), (Mg,Fe)SiO3

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Rhodonite

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

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)

Red Jasper

Silica (Silicon Dioxide), Formula: SiO2 with Iron impurities

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Painted River Rock

Artificially Coated Sedimentary Rock

Serpentinite (serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc

Greenstone / serpentinized rock

Serpentinite, commonly dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, and pyroxene

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals Mg₃Si₂O₅(OH)₄, with magnetite, olivine, and pyroxene remnants

Weathered quartz-rich pebble (probable quartzite or quartz vein fragment)

Quartzite, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the photograph

Fossil shark tooth

Likely fossilized shark tooth, possibly Carcharhinus or Otodus species

Rounded quartzite or quartz-rich sandstone cobble

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with minor iron-oxide staining

Serpentine-rich ultramafic rock

Serpentinite (predominantly serpentine-group minerals: lizardite, chrysotile, and/or antigorite)

Red Quartzite

Quartzite (SiO2)

Schist

Schist

Schist

Mica Schist

Pearl

Nacre (aragonite, CaCO₃, in an organic conchiolin matrix)

Aquamarine

Beryl (Be3Al2Si6O18)

Garnet

Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)

Jasper

Silicon dioxide (SiO2)

Serpentine-rich greenstone (probable serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite, chromite, and relict olivine/pyroxene

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Schist

Mica Schist