Sedimentary Or Igneous Fragment

Likely weathered granite or granitic pegmatite fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole

Weathered, garnet-bearing schist (tentative identification)

Mica schist, likely quartz–feldspar–mica schist; exact minerals cannot be confirmed from the photograph

Mica-rich rock, likely mica schist

Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar

Rough garnet-bearing metamorphic rock

Likely garnet amphibolite or garnet-bearing schist; garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Weathered quartz-rich metamorphic rock (probable gneiss or quartzite)

Biotite–quartz–feldspar gneiss, possibly micaceous quartzite

Quartz-rich sandstone or granitic fragment

Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph

Dark gneiss or banded metamorphic rock

Banded quartz–feldspar–mica gneiss; exact identification requires testing

Weathered granite fragment

Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite

Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Mica Schist fragment

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Tumbled green aventurine

Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica or chlorite

Likely quartz-rich stone or shell fragment

Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)

Banded Gneiss

Gneiss

Small, pale gray-green rock fragment

Undetermined fine-grained silicate rock; exact identification is not possible from the image

Unidentified Rock Fragment

Unknown

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Small rock fragments; likely mixed local gravel, not identifiable to one species

Unidentified lithic fragments; individual rock types cannot be determined reliably from this photograph

Weathered sandstone fragment

Clastic sandstone, likely quartz-rich (quartz arenite or arkose)

Fossiliferous limestone, likely coral or shell-rich fragment

Calcite (CaCO₃), commonly bioclastic limestone containing fossilized marine organisms

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Likely quartz-rich rock fragment

Unidentified pale, granular silicate specimen; possibly quartz or quartzite

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Yellow quartz fragment (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Mica-rich schist (likely biotite schist)

Mica schist, composed mainly of quartz and mica (biotite and/or muscovite)

Small quartz fragment (tentative)

Quartz, silicon dioxide (SiO₂)

Quartz Grain / Sandstone Fragment

Silicon Dioxide (SiO2)

Clear quartz fragment

Quartz, silicon dioxide (SiO₂)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Small quartz-rich pebble or rock fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide staining or host-rock inclusions

Clear quartz (rock crystal), possibly a small rough fragment

Quartz, silicon dioxide (SiO₂)

Likely garnet-bearing metamorphic rock

Garnet amphibolite or garnet-bearing schist; chiefly almandine garnet (Fe₃Al₂Si₃O₁₂) with amphibole, mica, and quartz

Quartz

Silicon Dioxide (SiO2)

Mica-rich schist (likely biotite–quartz schist)

Quartz–mica schist; chiefly quartz (SiO₂) with biotite and/or muscovite mica

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock