Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock Or Mineral (Depending On Origin And Purity) in the encyclopedia
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Gold Nugget
Native Gold (Au)
mineral
Pink Coral
Corallium rubrum (or related species, composed of calcium carbonate)
gemstone
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone or micritic limestone; exact identification requires testing
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Gold Nugget
Native Gold (Au)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Gemstone ring (stones not identifiable from image)
Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants
gemstone
Sandstone Anvil / Nutting Stone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Mica Schist
Mica Schist (contains muscovite/biotite, quartz, plagioclase)
metamorphic
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Ironstone (iron-oxide-rich rock)
Ferruginous sandstone or ironstone; likely composed chiefly of goethite and/or limonite, with quartz and clay
sedimentary
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Native gold nuggets
Gold (Au), usually with minor silver and copper
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Likely dyed or painted stone
Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.
metamorphic
Cowrie Shell Fossil
Cypraea sp.
fossil
Weathered gray sandstone or fine-grained metamorphic rock
Likely quartz-rich sandstone (quartz arenite), possibly weakly metamorphosed metasandstone
sedimentary
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Granodiorite Pebble
Granodiorite
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Agate
Chalcedony (SiO2)
mineral
Fluorite (translucent octahedral crystal)
Calcium fluoride (CaF2)
mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
River Rock
Siliciclastic rock (water-worn pebble)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Hag Stone (Sandstone with Boreholes)
Bored Sandstone (Sedimentary rock with lithophaga-style borings)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Opal cabochon
Hydrated amorphous silica, SiO₂·nH₂O; likely common or synthetic opal
gemstone
Diamond jewelry
Diamond (crystalline carbon, C)
gemstone
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary