Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Category
Mineral (Pseudomorph)
Browse mineral (pseudomorph) specimens identified by the Rock Identifier community.
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Gneiss
Gneiss
metamorphic
Chalcopyrite in Gossan
Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix
mineral
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Polished turquoise
Turquoise — hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Chrysocolla (Copper Ore matrix)
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Hematite (Botryoidal)
Hematite (Fe2O3)
mineral
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Gold Ore (Lode Gold)
Native Gold (Au) in Matrix
mineral
Native Sulfur
Sulfur (S)
mineral
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Red Sandstone
Arenite
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Tiger's Eye
Quartz (SiO2) with fibrous inclusions of Altered Crocidolite
mineral
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Limonite/Goethite Concretion
Goethite (FeO(OH))
sedimentary
Basalt
Basalt
Igneous
Chrysocolla
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O
Mineral
Quartz Sand / Sandstone grains
Silicon Dioxide (SiO2)
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Tiger's Eye (Golden and Blue)
Silicon Dioxide (SiO2) with fibrous inclusions of Crocidolite
mineral
Pegmatite (Graphic Granite / Granite Pegmatite)
Coarse-grained intrusive igneous rock (Felsic)
igneous
Quartz with Tourmaline
Silicon Dioxide with complex boro-silicate (Quartz: SiO2)
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Milky quartz (quartz-rich rock fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral