Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Diamond
Diamond (pure Carbon, C)
mineral
Tumbled green-and-white stone, likely serpentine
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc
metamorphic
Citrine
Silicon dioxide (SiO2)
mineral
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Chert Nodule (with Flint core)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Tumbled chalcedony (likely brown agate/jasper)
Microcrystalline quartz, SiO₂; potentially iron-stained chalcedony or jasper
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Sandstone
Arenite
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2
mineral
Iron-rich sandstone or lateritic rock
Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Bismuth
Bismuth (Bi)
Mineral
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chondrite Meteorite
L or H Ordinary Chondrite
meteorite
Sandstone
Clastic Sedimentary Rock
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Peacock ore (iridescent chalcopyrite, possibly bornite)
Chalcopyrite, CuFeS₂; the iridescent surface may be natural tarnish or artificial acid treatment. Similar material is bornite, Cu₅FeS₄.
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Diamond
C (Native Carbon)
mineral
Diamond
C (Carbon)
gemstone
Jasper (Multi-color Chert)
Silicon Dioxide (SiO2) with impurities
sedimentary
Flint (Chert)
Cryptocrystalline Silica (SiO2)
sedimentary
Rose Quartz
Pink Quartz (SiO2)
mineral
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Terrazzo flooring containing marble aggregate
Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo
metamorphic
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Diamond (or Diamond Simulant/Cubic Zirconia)
Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Rough Diamond
Carbon (C)
gemstone
Diamond
Native Carbon (C)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled greenish serpentine
Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄
metamorphic