Polished turquoise-like stone
Likely turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the photo
mineral
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Botryoidal chalcedony/geode fragment
Chalcedony, microcrystalline quartz (SiO₂), likely iron-oxide coated
mineral
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Quartz-rich chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; fibrous chalcedony with iron-oxide inclusions
mineral
Red jasper-like chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Weathered iron-rich rock, possibly jasper or ironstone
Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests
mineral
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Tumbled brown stone, possibly chert or iron-stained quartzite
Indeterminate from photograph; possible microcrystalline quartz (SiO₂)
mineral
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Weathered greenish rock fragment
Tentatively altered basalt or serpentinite; exact identification requires testing
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Weathered rock pebble, possibly quartz-rich sandstone
Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining
sedimentary
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Sandstone
Sedimentary Clastic Rock
sedimentary
Tumbled yellow jasper (probable)
Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions
mineral
White druzy quartz pendant with a blue crystal accent
Quartz (SiO₂); the blue material is not identifiable from the image
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Sandstone
Quartz Arenite / Sedimentary Rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary