Anthropogenic Material (Man Made Rock)

Sandstone

Arenite (primarily SiO2)

Chert (Nodule)

Chert (Silica, SiO2)

Red Sandstone

Arenite (high iron oxide content)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Limestone

Calcium Carbonate (CaCO3)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartzite

Metamorphic rock predominantly composed of Quartz (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Unakite

Epidotized Granite

Quartz (Milky/Yellowish variety)

Silicon Dioxide (SiO2)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Chert (and its variety Flint)

Silicon dioxide (SiO2) / Microcrystalline quartz

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Vesicular Basalt

Mafic Volcanic Rock (Basalt)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Chert (Yellow/Brown variety)

Chert (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Arenite (Siliclastic sedimentary rock)

Mica Schist

Mica Schist (primarily composed of Muscovite, Biotite, and Quartz)

Red Sandstone

Arenite (predominantly SiO2 with Fe2O3 staining)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Chert (White Chert/Flint)

Silicon Dioxide (SiO2)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Chert (Nodule)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Slate

Slate (Foliated Metamorphic Rock)

Granite

Granite (Felsic Plutonic Rock)

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Chert (Nodular)

Microcrystalline Silica (SiO2)