Not A Rock Or Mineral (Anthropogenic Material)

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Schist

Mica Schist

Vesicular volcanic rock, likely scoria

Scoria; composition commonly basaltic to andesitic, rich in plagioclase and pyroxene

Sandstone (with Moss)

Quartz Arenite / Sandstone

Unidentified pale mineral or rock surface

Indeterminate from image; possibly a small quartz or feldspar grain

Unidentified rock fragments

Indeterminate; likely a weathered, iron-stained silicate rock

Sandstone

Clastic sedimentary rock (Quartz arenite)

Sandstone

Arenite (SiO2 principal)

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Likely polished or naturally smoothed pebble with a pale mineral patch

Undetermined; possibly a dark volcanic rock with a quartz or feldspar inclusion

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Red Sandstone

Arenite (Iron-rich)

River cobble (Greywacke/Sandstone)

Sandstone / Greywacke

Blue-green rough mineral specimen (identity uncertain)

Undetermined; the image is insufficient for a reliable mineral identification

Small cylindrical mineral/stone fragment

Undetermined; the image is insufficient for reliable mineral identification

Possible iron-rich pebble with a weathered inclusion

Unidentified; image alone does not support a reliable mineral or rock identification

Polished dark agate or jasper specimen

Cryptocrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Sandstone (Wonderstone)

Clastic Sedimentary Rock (primarily SiO2)

Greenish metamorphic rock (possibly chlorite schist)

Chlorite-rich schist; exact identification is uncertain from the image

Tumbled turquoise

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Weathered quartz pebble (tentative)

Quartz, SiO₂; possibly iron-stained quartz or quartz-rich rock

Quartz-rich geode or mineralized cavity in host rock

Likely a quartz-bearing geode; the pale crystals may be quartz (SiO₂), but the photo is not detailed enough for a firm identification.

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Rounded gray-green rock, likely gneiss

Gneiss (tentative; mineral composition and texture cannot be confirmed from the image)

Quartz Pebble with Drusy/Crystalline Pocket

Silicon Dioxide (SiO2)

Coarse sand with a small pebble

Unconsolidated siliciclastic sediment, chiefly quartz and rock fragments

Sandstone

Arenite (primarily SiO2)

Iron-stained quartz-rich rock

Likely quartz with iron-oxide staining; exact rock type cannot be determined from the photo

Rounded river pebble, likely quartz-rich stone

Unidentified lithic clast; exact mineralogy cannot be determined from the image

Fossil Snail

Gastropoda (fossilized)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Polished dendritic agate or jasper pebble

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide inclusions

Sandstone

Sedimentary Clastic Rock

Milky quartz pendant

Quartz (silicon dioxide, SiO₂)

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz/chalcedony with iron- and manganese-bearing inclusions; SiO₂

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic Sedimentary Rock

Petrified Wood

Silicified Wood (SiO2)

Turquoise (rough, likely stabilized or treated)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Cobaltoan Calcite / Pink Dolomite (Possible)

Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))