Diamond (Faceted)
Carbon (C)
Category
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Diamond (Faceted)
Carbon (C)
Sandstone (Pebble)
Arenite (primarily SiO2)
Clear/White Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
Limonite/Ironstone
Limonite (Hydrous ferric oxides), FeO(OH)·nH2O
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
Fluorite (likely)
Calcium Fluoride (CaF2)
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
River Pebble
Quartzo-feldspathic rock fragment
Sandstone (Quartzose)
Arenite
Conglomerate
Conglomerate (a clastic sedimentary rock)
Halite
Sodium Chloride (NaCl)
Sandstone
Arenite (primarily Quartz, SiO2)
Sandstone
Arenite (SiO2 primarily)
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃)
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
Quartzite
Metamorphosed Sandstone (Mainly SiO2)
Sandstone (with Lichen)
Arenite (primarily SiO2)
Sandstone
Arenite (lithic or quartz sandstone)
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
Pebble
Lithic fragment / Sedimentary clast
Diamond
Native Carbon (C)
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
Fluorite
Calcium Fluoride (CaF2)
Granite Cobble
Granite (Porphyritic/Coarse-grained)
Sandstone
Clastic sedimentary rock (Quartz arenite)
Quartzite
Quartzite (primarily SiO2)
Sandstone (Quartzose Sandstone)
Arenite (SiO2 primarily)
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Sandstone
Arenite (primarily SiO2)
Diamond (in jewelry setting)
Diamond (Carbon, C)
Sandstone
Arenite (primarily SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Quartz Grain
Silicon Dioxide (SiO2)