Metamorphic Or Sedimentary

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂)

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz vein in host rock

Quartz (SiO₂), likely milky quartz; host rock is uncertain from the photo

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Polished gray pebble, likely quartzite or chert

Quartzite (mostly SiO₂), tentative identification

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Pyrite

Iron Sulfide (FeS2)

Quartz (Pebble)

Quartz (SiO₂)

Tumbled quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly iron-stained milky quartz or quartzite

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Weathered quartz-rich pebble, possibly granite or granodiorite

Felsic intrusive rock; chiefly quartz, feldspar, and minor mica/amphibole

Quartz

Silicon Dioxide (SiO2)

Quartzite Pebbles with Quartz Veining

SiO2 (Silicon Dioxide with country rock matrix)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz

SiO₂ (Silicon Dioxide)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Jasper (Green Jasper/River Stone)

Silicon Dioxide (SiO2) with impurities

Quartz pebble

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz in weathered host rock

Quartz, SiO₂; likely a quartz vein in altered country rock

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Quartz vein fragment

Milky quartz (SiO₂), possibly with weathered host rock

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz

Quartz (SiO₂)

Quartz pebble

Silicon dioxide (SiO2)

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz-bearing granitic or metamorphic material (SiO₂-dominant)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Small pale mineral fragment

Unidentified; possibly quartz, calcite, or feldspar

Weathered volcanic rock, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; primarily plagioclase feldspar, pyroxene, and possibly olivine or iron oxides

Milky Quartz

Silicon Dioxide (SiO2)