Not A Rock Or Mineral (Anthropogenic Material)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Sandstone

Sandstone (Siliciclastic Sedimentary Rock)

Sandstone

Clastic sedimentary rock

Plume Agate or Moss Agate

Agate (SiO2)

Sandstone

Arenite

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Laterite (Iron-rich bauxite or Gossan)

Ferricrete (Fe2O3·nH2O)

Polished turquoise-like stone

Likely turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the photo

Sandstone

Arenite (SiO2 based with mineral cement)

Sandstone Pebble

Sandstone (primarily Quartz, SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Botryoidal chalcedony/geode fragment

Chalcedony, microcrystalline quartz (SiO₂), likely iron-oxide coated

Quartz-rich chalcedony (likely jasper or agate)

Microcrystalline quartz, SiO₂; fibrous chalcedony with iron-oxide inclusions

Sandstone

Clastic sedimentary rock (Quartz arenite or arkose)

Sandstone

Clastic Sedimentary Rock

White jade (likely nephrite) beads

Nephrite jade, an interlocking amphibole aggregate dominated by tremolite–actinolite; exact identification requires testing

Red jasper-like chalcedony pebble

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Sandstone

Clastic Sedimentary Rock

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sandstone

Sedimentary Rock (Quartz arenite)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered iron-rich rock, possibly jasper or ironstone

Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests

Sandstone

Sedimentary Rock (Quartz Sandstone)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Sandstone

Sedimentary Clastic Rock

Tumbled brown stone, possibly chert or iron-stained quartzite

Indeterminate from photograph; possible microcrystalline quartz (SiO₂)

Weathered greenish rock fragment

Tentatively altered basalt or serpentinite; exact identification requires testing

Red Sandstone

Arenite (Ferruginous Sandstone)

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining

Dalmatian jasper beads

Commercially “Dalmatian jasper”; commonly spotted, silica-rich rock sold as jasper, though many specimens are feldspar-rich rock rather than true jasper (microcrystalline quartz).

Milky quartz with dark mineral inclusions

Quartz, SiO₂; dark inclusions are not identifiable from the image

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone with Dendritic Inclusions

Quartzose Sandstone

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Sandstone

Clastic Sedimentary Rock

Iron Slag

Ferrous Slag (Industrial Byproduct)

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)