Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Mineral Formation) in the encyclopedia
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Jasper
Jasper (Silicate mineral, SiO2)
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Bone Fossil
fossil
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary (secondary formation)
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Leopard Skin Jasper or Ring Jasper
Microcrystalline Quartz (Chalcedony with impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Hematite (Specularite)
Fe2O3 (Iron(III) oxide)
mineral
Sandstone (Quartzose Pebble)
Arenite (SiO2)
sedimentary
Fossil-bearing sandstone or mudstone
Indeterminate sedimentary matrix with a possible bivalve or shell fossil
fossil
Native Copper
Native Copper (Cu)
mineral
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)
sedimentary
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Limonite-stained Chert
Microcrystalline Quartz (SiO2) with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Yellow Quartz (Iron-stained Quartz)
Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities
mineral
Jasper and Mixed River Pebbles
Microcrystalline Quartz (Chalcedony / Jasper)
sedimentary
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Weathered banded sandstone pebble
Quartz-rich sandstone (predominantly SiO₂)
sedimentary
Vesicular basalt (possible scoria)
Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas
igneous
Magnetite / Hematite mix
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Hematite Ball
Iron(III) oxide (Fe2O3)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise (possible Dyed Magnesite/Howlite)
CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary