Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)

Weathered sandstone or granitic rock fragment

Indeterminate siliciclastic rock; likely quartz–feldspar–mica aggregate

Pink granite

Felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and dark biotite/hornblende

White Quartz

Silicon Dioxide (SiO2)

Magnetite (Octahedral Crystal)

Magnetite (Fe3O4)

Yellow Apatite

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

Weathered rock pebble, possibly sandstone

Likely quartz-rich sandstone; precise identification requires closer examination

Red jasper chips

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Mixed quartz gemstone bead bracelet

Quartz, silicon dioxide (SiO₂), in varieties including smoky quartz, amethyst, rutilated quartz, and possibly tourmalinated quartz

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

River Pebbles (including Granite and Basalt)

Mixed Igneous Rocks (Granite, Basalt)

Unakite

Epidotized Granite

Quartz Pebble

Silicon Dioxide (SiO2)

Polished decorative stone spheres

Mixed material; individual spheres may be agate, jasper, quartz, or other ornamental minerals

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica

Granite Pegmatite

Pegmatite (Quartz, Feldspar, Mica)

Tumbled mixed mineral specimens, likely quartz-rich rocks

Predominantly quartz (SiO₂), with possible jasper, agate, feldspar, and iron-oxide minerals

Iron-rich sandstone or ferruginous conglomeratic sandstone

Ferruginous sandstone, primarily quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Unakite

Epidotized Granite

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Unakite (or Epidote-rich Granite)

Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)

Rounded, foliated metamorphic pebble (likely schist)

Mica schist, composition uncertain from the image

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper

Conglomerate (Greenstone/Pebble Conglomerate)

Polymictic Conglomerate

Milky Quartz

Silicon Dioxide (SiO2)

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with sulfide minerals

Gneiss

Gneiss (Metamorphic rock)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Likely rough quartz with iron-oxide staining

Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining

Mixed River Pebbles (including Unakite and Jasper)

Polymineralic geological specimens

Quartz Pebble

Silicon Dioxide (SiO2)

Polished granite or granitic gneiss pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Asphalt Concrete

Bituminous conglomerate

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment

Magnetite

Magnetite (Fe3O4)

Bauxite

Bauxite (Al2O3·2H2O mixed with iron oxides)