Igneous And Metamorphic Derivative (Weathered)

Tumbled quartz-rich pebble

Quartz (SiO₂), likely with iron-oxide staining and minor inclusions

Likely weathered quartz-rich rock, possibly granite or gneiss

Granite–gneiss assemblage; chiefly quartz, feldspar, and dark mica/amphibole

Quartz Pebble

Silicon Dioxide (SiO2)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic

Quartz pebble

Silicon dioxide (SiO2)

Weathered quartz-bearing rock fragments

Likely quartz (SiO₂) in a weathered iron-stained host rock; exact identification is uncertain from the image

Quartz-rich pebble, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or feldspar impurities

Blue beach pebble, likely milky quartz or quartz-rich stone

Quartz (SiO₂), possibly a quartz-rich pebble; identification is tentative from the image

Small tumbled quartz-like pebble

Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar

Quartz-rich metallic-looking pebble

Likely quartz or quartzite; exact identification is uncertain from the blurred image

Quartz-rich rock fragment (tentative)

Quartz, silicon dioxide (SiO₂), possibly in a weathered host rock

Weathered quartz-bearing rock, possibly iron-stained quartzite or granitic pegmatite

Indeterminate; likely quartz-rich silicate rock with iron-oxide staining (SiO₂-dominant)

Rounded quartz-rich pebble, possibly milky quartz

Quartz (SiO₂), provisional identification

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Grit)

Silicon Dioxide (SiO2)

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Milky Quartz

Silicon Dioxide (SiO2)

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz-rich granitic rock (likely weathered granite)

Granite; chiefly quartz, feldspar, and mica, with possible iron-oxide staining

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Bornite

Copper Iron Sulfide (Cu5FeS4)

Likely quartz-rich stone, possibly quartzite or milky quartz

Quartz (silicon dioxide, SiO₂); exact rock identification is uncertain from the image

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Weathered quartz-bearing rock, possibly granitic gneiss

Quartz–feldspar–mica aggregate; exact identification requires testing

Coarse-grained granite or granitic pegmatite fragment

Granite; primarily quartz, feldspar, and mica

Likely weathered gneiss or mica-rich schist

Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist

Small weathered quartz-rich pebble

Likely quartz (SiO₂), possibly quartzite or feldspar-bearing rock

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Blue Quartz (Dumortierite Quartz)

SiO2 with inclusion of AlAl6BSi3O18

Weathered gray-green pebble

Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock

Weathered mafic rock, likely basalt

Basalt (fine-grained plagioclase–pyroxene rock; exact identification requires testing)

Likely weathered blue-gray basalt

Basalt, a fine-grained mafic volcanic rock; commonly plagioclase + pyroxene ± olivine and iron oxides

Weathered basaltic rock

Basalt, likely amygdaloidal or altered basalt

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Milky quartz-rich rock

Quartz, silicon dioxide (SiO₂), likely massive milky quartz with iron-oxide or feldspar impurities

Quartz

Silicon Dioxide (SiO2)