Not A Rock Or Mineral (Anthropogenic Material)

Weathered iron-rich quartz or limonite-bearing stone

Quartz (SiO₂) with iron-oxide/hydroxide coatings, likely goethite–limonite

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Iron-stained quartz-rich rock

Likely ferruginous quartzite or iron-oxide-stained quartz; exact identification is uncertain from the photo

Serpentine-rich rock (likely serpentinite)

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄

Sandstone

Sandstone (SiO2 dominant)

Sandstone

Sedimentary quartz arenite

Gneiss

Gneissic Metamorphic Rock

Gneiss

Metamorphic Rock (Gneissic texture)

Sandstone

Arenite (typically SiO2 + others)

Sandstone (Pebble / Cobble)

Arenite / Sedimentary Rock (composed of quartz and feldspar)

Iron-oxide-stained rock, likely limonite/goethite-bearing stone

Limonite (a mixture of hydrated iron oxides, commonly including goethite, FeO(OH)) coating or staining a host rock

Milky quartz in dark host rock

Quartz (SiO₂), likely as a vein or vein fragment; host rock uncertain

Orbicular gneiss (likely augen gneiss)

Quartz–feldspar–biotite gneiss; locally termed augen gneiss

Sandstone

Arenite (SiO2 dominated sandstone)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Weathered golden-brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or a sulfide-bearing rock

Sandstone

Arenite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (predominantly SiO2 quartz grains)

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

Small dark mineral fragment

Undetermined; image lacks diagnostic detail for reliable identification

Fossilized bivalve shell in limestone

Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Jasper and Quartz Breccia

Silicified Breccia (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Tumbled serpentine-rich stone

Serpentinite, commonly dominated by antigorite, lizardite, or chrysotile

Earthy iron-rich clay or weathered laterite

Hydrated iron oxides and clay minerals, commonly goethite/hematite with kaolinite or illite

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Blue sodalite-bearing rock, possibly lapis lazuli

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), likely in a feldspathoid-rich aggregate

Sandstone (likely Arkosic or Ferruginous)

Arenite (SiO2 with iron oxides or feldspar)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Granite Cobble

Granite (Phaneritic Igneous Rock)

Ironstone / iron-oxide-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone

Quartz-rich foliated rock, possibly milky quartz vein material

Likely quartz-rich metamorphic rock; exact identification is uncertain from the image

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Quartzose Sandstone (primarily quartz grains cemented by iron oxides)