Sandstone
Arenite (SiO2 based)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 based)
Milky Quartz
Silicon Dioxide (SiO2)
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
Chert (Flint)
SiO2 (Microcrystalline Quartz)
Sandstone
Clastic Sedimentary Rock
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
Quartz
Silicon Dioxide (SiO2)
Metallic sulfide ore, likely galena-bearing rock
Galena (lead sulfide, PbS), possibly with pyrite or other sulfides
Chert
Chert (Microcrystalline Quartz)
Clear Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
Quartz Geode
Silicon dioxide (SiO2)
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
Iron-stained garnet-bearing rock, possibly almandine garnet
Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
Gold Nugget
Native Gold (Au)
Quartz Geode Cluster (Iron-stained Quartz)
Silicon Dioxide (SiO2)
Sandstone
Clastic sedimentary rock (primarily Quartz)
Sandstone
Sedimentary Rock (Quartz Arenite)
Sandstone
Sedimentary Rock (Quartz Sandstone)
Epidote and Quartz in Basalt Porpohyry
Epidote bearing Porphyritic Basalt with Quartz Veins
Milky Quartz
Silicon Dioxide (SiO2)
Yellow Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Agate
Silicon dioxide (SiO2)
Gold Nugget Jewelry
Native Gold (Au)
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
Dark gray volcanic rock, probably andesite or basalt
Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite
Milky Quartz
Silicon Dioxide (SiO2)
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
Quartz
Quartz (SiO2, Silicon Dioxide)
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities