Sandstone
Arenite (SiO2 based)
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Tumbled quartz-rich chalcedony (likely carnelian or orange jasper)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides
mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Sandstone
Arenite
sedimentary
Mineral Sand (Heavy Mineral Sand Concentrate)
Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite
mineral
Gold
Gold (Native Element); Au
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz-rich granite pebble
Granite, composed mainly of quartz, feldspar, and mica
igneous
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Gold Grain
Native Gold (Au)
mineral
Likely polished copper-bearing stone or copper nugget
Uncertain from the image; possibly native copper (Cu) or copper-stained rock
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Silver (Native Element)
Ag (Native Silver), with minor Copper (Cu)
mineral
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Weathered dark mineral/rock fragment
Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral
mineral
Likely copper ore (native copper or copper-rich mineral)
Possibly native copper (Cu); exact identification is uncertain from the image
mineral
Sandstone
Sandstone (Silicon dioxide, SiO2 based)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine (or Xiuyan Jade / Serpentine)
Silicon Dioxide (SiO2) with Fuchsite inclusions or Magnesium Silicate
metamorphic
Sandstone
Arenite (SiO2 based with various cements)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary