Igneous Or Mineral

Weathered fossil shell fragment

Likely a fossilized bivalve or gastropod fragment; exact taxon cannot be determined from one view

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered limestone or calcareous tufa

Calcite-rich carbonate rock, primarily CaCO₃ (often micritic limestone or travertine/tufa)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz (白 quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely anhedral to drusy quartz

Uncertain gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact identification requires close examination

Milky quartz specimen

Quartz (silicon dioxide, SiO₂)

Gneiss (with Quartzite and Mica)

Gneiss

Milky quartz

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Likely quartz-bearing rock or mineral fragment

Probable quartz (SiO₂), possibly a weathered pegmatite or chalcedony fragment

Milky quartz rough chips

Quartz (silicon dioxide, SiO₂)

Milky quartz (likely vein quartz)

Quartz, silicon dioxide (SiO₂)

Banded metamorphic rock, likely gneiss or banded amphibolite

Quartz–feldspar–biotite gneiss or amphibolite; exact identification requires thin-section or mineral tests

Fossil-bearing fine-grained sedimentary rock

Likely fossiliferous mudstone or shale; visible feature may be a plant fragment, trace fossil, or mineral vein

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Apatite

Fluorapatite (Ca5(PO4)3F)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Red cabochon gemstone, likely garnet

Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identification from the image is uncertain

Pegmatite with Tourmaline and Quartz

Igneous Pegmatite

Magnetite Ore

Magnetite (Fe3O4)

Quartz

Silicon dioxide (SiO2)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Magnetite

Iron(II,III) oxide (Fe3O4)

Pegmatite

Igneous Pegmatite

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Basalt

Basalt

Magnetite

Magnetite (Fe3O4)

Pegmatite

Igneous Pegmatite

Likely garnet crystal

Garnet-group silicate; species cannot be determined from the image

Green Mica

Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2

Weathered granite (probable)

Granite; a coarse-grained rock composed chiefly of quartz, feldspar, and mica

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Granite (likely)

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica