Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Fossiliferous)
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
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Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Travertine
Travertine (CaCO3)
sedimentary
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Halite
Halite (NaCl)
mineral
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Agate
Cryptocrystalline quartz (SiO2)
mineral
Halite
Halite (NaCl)
mineral
Agate
Agate (Cryptocrystalline Quartz)
mineral
Grey Chalcedony (Tumbled Moon)
Microcrystalline Quartz (SiO2)
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (White/Gray variety)
Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Silicified Snail Fossil
Gastropod (likely replaced by Chalcedony/Quartz - SiO2)
fossil
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Sandstone (various mineral compositions)
Sedimentary