Diamond
Carbon (C)
mineral
Category
Sedimentary (Man Made)
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Man Made) in the encyclopedia
View all →
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily Quartz and Feldspar)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Native Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Rough Diamond
Pure Carbon (C)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Tumbled chalcedony (likely blue-gray agate)
Cryptocrystalline quartz, SiO₂; chalcedony/agate variety
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Weathered brown stone, possibly basalt or iron-rich sedimentary rock
Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone
igneous
Tree Agate
Chalcedony (SiO2)
gemstone
Diamond (in jewelry setting)
Carbon (C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Sandstone
Arenite
sedimentary
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartzite
Silica (SiO2) quartzite
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Quartz
Quartz (SiO₂)
Mineral
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Milky Quartz
Quartz (SiO2)
Mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral