Sandstone
Arenite (SiO2 based)
sedimentary
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
sedimentary
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Graphite
Graphite (C)
mineral
Citrine Quartz
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Blue Quartzite
Quartzite (silicon dioxide, SiO2)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
mineral
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
Cinnabar in Dolomite or Quartz (Cinnabrite)
Mercury sulfide (HgS) in Dolomite (CaMg(CO3)2)
metamorphic
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Breccia
Sedimentary Breccia
sedimentary
Epidote with Quartz
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Gold
Gold (Au)
mineral
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Quartzite Cobble / Quartz River Pebble
Silicon Dioxide (SiO2) - Quartzite / Quartz
metamorphic
Sandstone pebble
Sandstone (Quartz-rich Arenite)
sedimentary
Fuchsite
Cr-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2)
mineral
Chert (and associated Sedimentary rocks)
Microcrystalline Silica (SiO2)
sedimentary
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly massive magnetite/ironstone
mineral
Jasper in Quartzite (likely Cinnabar or Iron inclusions)
Silicon dioxide (SiO2) with impurities
metamorphic
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
sedimentary
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Polygenetic Conglomerate (or Breccia)
Clastic Sedimentary Rock
sedimentary
Beryl (Aquamarine) in Matrix with Schorl
Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Limestone with Fossil
Sedimentary limestone, calcium carbonate (CaCO3)
sedimentary
River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
metamorphic
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral