Industrial Byproduct (Anthropogenic Rock Like Material)

Granodiorite

Granodiorite (Na,Ca)(Al,Si)4O8

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Yellow Jade (Quartzite Jade)

Quartzite (SiO2)

Sandstone

Clastic Sedimentary Rock

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Iron-stained quartz vein rock

Quartz-rich rock with iron-oxide/hydroxide coatings (hematite/goethite); exact host rock undetermined

Petrified Wood

Silicified wood (SiO2)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz (Gravel Fragment)

Silicon Dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock

Bauxite (Laterite)

Hydrated aluminum oxides (Al2O3·nH2O)

Sandstone (Pebble)

Sandstone (SiO2 with iron oxide impurities)

Tumbled brecciated jasper (likely iron-stained quartz/chalcedony)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Rounded river pebble, likely quartz-rich sandstone or weathered granite

Indeterminate lithic clast; probable quartz–feldspar aggregate with iron-oxide staining

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Diamond and Sapphire

Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Petrified Wood

Agatized or Silicified Wood (SiO2)

Iron-rich sandstone concretion

Ferruginous sandstone, cemented chiefly by iron oxides (such as goethite and hematite)

Serpentinite

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

Sandstone

Clastic sedimentary rock composed mainly of quartz sand

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Sandstone

Sedimentary Clastic Rock

Polished ocean jasper (orbicular jasper)

Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony

Milky quartz vein material

Quartz, silicon dioxide (SiO₂), likely massive vein quartz

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Possible fossilized bone or tooth fragment

Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate

Fossilized Bone Fragment

Vertebrate Fossil

Weathered granitic rock fragment

Likely granite or granodiorite; exact identification is uncertain from the image

Weathered quartz-rich rock, possibly quartzite or chert

Quartz (SiO₂), likely in a quartzite matrix; exact identification is uncertain from the image

Garnet Schist

Garnetiferous Micaceous Schist

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or volcanic shell

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide impurities)

Sandstone

Sandstone (clastic sedimentary rock)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Painted Sandstone Cobble

Clastic Sedimentary Rock (Sandstone base)

Sandstone

Clastic Sedimentary Rock

Greenschist

Greenschist metamorphic rock

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)