Sedimentary Rock (Possibly Composed Of Various Minerals)

Sandstone

Arenite (SiO2 secondary)

Gneiss

Gneiss

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone

Clastic Sedimentary Rock

Sandstone

Arenite

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Sandstone

Sedimentary rock composed mainly of quartz and feldspar

Shale

Shale (fine-grained clastic sedimentary rock)

Quartz-veined Sandstone

Quartzite-veined Arenite (SiO2)

Sandstone Pebble

Sedimentary quartz arenite

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Lapis Lazuli

Lapis lazuli (rock composed mainly of lazurite, calcite, and pyrite)

Quartz pebble

Silicon dioxide (SiO2)

Weathered sandstone boulder

Quartz-rich sandstone, likely arkose or lithic sandstone

Hematite

Iron(III) oxide (Fe2O3)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Small brown mineral or rock fragment

Undetermined; the image does not show enough diagnostic detail for reliable identification

Granite Pebble

Phaneritic intrusive igneous rock

Sandstone (Quartz-rich)

Arenite

Likely weathered chert or siliceous shale

Cryptocrystalline quartz (SiO₂), possibly with clay minerals

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Sedimentary rock composed mainly of quartz and feldspar

Likely chlorite schist

Chlorite-rich schist; commonly composed of chlorite, quartz, and mica

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)

Weathered iron-rich rock, possibly laterite or ironstone

Ferruginous sandstone/laterite; commonly composed of hematite (Fe₂O₃), goethite (FeO(OH)), limonite, and quartz

Quartz-rich rock (possibly quartzite)

Quartzite, composed mainly of quartz (SiO₂)

Limonite

FeO(OH)•nH2O

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Weathered quartz-rich pebble

Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Brecciated rock (possibly fault breccia)

Polymictic breccia; exact lithology cannot be determined from the photograph

Not a rock, mineral, or geological specimen

Likely foliated metamorphic rock (schist or phyllite)

Undetermined from the image; possibly mica-rich schist or phyllite

Chert Nodule

Microcrystalline Quartz (SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with minor feldspar, mica, or iron oxides

Gneiss

Feldspathic biotite gneiss; a high-grade metamorphic rock composed mainly of quartz, feldspar, and mica

Iron-rich weathered rock, possibly goethite/limonite-bearing sandstone or ironstone

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite, Fe₂O₃)

Chlorite-rich schist (probable greenschist)

Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism

Silver-colored mica schist

Muscovite–quartz schist, possibly with biotite

Weathered iron-rich rock, possibly basalt or limonite-bearing sandstone

Undetermined; likely Fe-oxide-stained basalt or ferruginous sandstone (hematite/goethite-bearing)

White Quartz

Silicon Dioxide (SiO2)