Mineral, Part Of A Rock

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Tumbled Stone

Silicon dioxide / Various silicates

Quartz-veined Metamorphic Rock

Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)

Banded River Rock with Quartz Vein

Siltstone/Greywacke with Quartz (SiO2)

Calcite

Calcite (CaCO3)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Concretion

Sedimentary Concretion

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)

Veined Metabasalt / Veined Greywacke

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Weathered iron-rich rock, likely limonite/goethite-bearing laterite

Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

Granite

Intrusive Igneous Rock

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Sandstone Cobble

Clastic Sedimentary (Sandstone)

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone

Arenite (SiO2 principal)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Variscite

Variscite (AlPO4·2H2O)

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Copper Ore (Malachite and Limonite bearing rock)

Copper-bearing rock with secondary copper minerals

Graphic Granite (or Rapakivi-textured Granite)

Alkali feldspar granite

Quartz with Mafic/Chlorite Veins

Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining

Sandstone

Sedimentary Rock (Quartz Sandstone)

Shale

Shale (clastic sedimentary rock)

Shale

Argillite / Shale

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Intrusive Igneous Rock

Quartz-veined Basalt or Diabase Pebble

Igneous rock with hydrothermal quartz vein

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Hydrothermal Quartz Breccia

Hydrothermal Breccia with Quartz and Chloritic/Epidote Clasts