Sandstone
Arenite (SiO2 based typically)
Category
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 based typically)
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
Sandstone
Arenite (variable SiO2 composition)
Granite
Phaneritic Felsic Igneous Rock
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
Sandstone
Arenite
Chert (Flint)
SiO2 (Microcrystalline Quartz)
Sandstone
Arenite (composed primarily of SiO2)
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
Sandstone
Arenite (primarily SiO2)
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
Basalt
Basalt (Mafic volcanic rock)
Native Silver
Silver (elemental Ag)
Granite
Granite (plutonic igneous rock)
Quartzite
Metamorphic Quartzite (SiO2)
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
Marble
Metamorphic Limestone (CaCO3)
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Sedimentary Rock (Quartz arenite)
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
Granite
Phaneritic Felsic Igneous Rock
Basalt
Basalt (Mafic volcanic rock)
Diorite
Intermediate plutonic igneous rock
Granite
Granite (Felsic Plutonic Rock)
Granite
Granite (Silicic Intrusive Igneous Rock)
Unakite
Altered Granite (Epidotized Granite)
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives