Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Category
Igneous And Mineral
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Pink amethyst or pale pink quartz gemstone
Quartz, SiO₂; pink coloration may result from microscopic inclusions or irradiation-related defects
gemstone
Polished smoky quartz
Quartz (SiO₂), smoky variety
mineral
Weathered Pyrite Nodule
Iron Sulfide (FeS2) undergoing oxidation to limonite/goethite
mineral
Smoky quartz (likely rough or tumbled fragment)
Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum
mineral
Pink quartz beads (likely rose quartz)
Quartz, SiO₂; pink color commonly from trace inclusions or lattice defects
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Smoky quartz (probable)
Quartz, silicon dioxide (SiO₂), brown smoky variety
mineral
Moonstone
Orthoclase/Albite (KAlSi3O8 / NaAlSi3O8) with Adularescence
mineral
Iron-rich mineral specimen, possibly magnetite-rich ore
Possibly magnetite (Fe₃O₄), with associated iron oxides; identification is uncertain from the photograph
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Milky quartz (rose-tinted quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Faceted brown gemstone pendant, likely smoky quartz or champagne topaz
Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)
gemstone
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed rock and mineral specimens
Multiple unidentified silicate rocks and minerals; likely quartz-bearing material, feldspar, mica, and iron-oxide-bearing stones
mineral
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red cabochon gemstone, likely garnet
Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identification from the image is uncertain
gemstone
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Magnetite Ore
Magnetite (Fe3O4)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Pegmatite
Igneous Pegmatite
igneous
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Basalt
Basalt
Igneous
Magnetite
Magnetite (Fe3O4)
mineral
Pegmatite
Igneous Pegmatite
igneous
Likely garnet crystal
Garnet-group silicate; species cannot be determined from the image
mineral
Green Mica
Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Weathered granite (probable)
Granite; a coarse-grained rock composed chiefly of quartz, feldspar, and mica
igneous
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Granite (likely)
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
igneous