Sandstone
Arenite (SiO2 principal)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Quartz Beach Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Sandstone (composed predominantly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Sandstone
Sedimentary quartz arenite
sedimentary
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
igneous
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Tumbled white quartz or quartzite pebble
Quartz (SiO₂), possibly massive quartzite
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Diamond
Diamond (pure native carbon, C)
mineral
Amethyst (likely rough or cleaved fragment)
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Quartz-rich vein rock, likely milky quartz in weathered host rock
Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Diorite
Intermediate plutonic igneous rock
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Goethite coatings
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Rough Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral