Granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Category
Mineral Pseudomorph
Browse mineral pseudomorph specimens identified by the Rock Identifier community.
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Vesicular Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock)
Igneous
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Gneiss
Gneiss
metamorphic
Granite
Intrusive igneous felsic rock
igneous
Fluorite Tower
Fluorite (Calcium Fluoride - CaF2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Granite
Intrusive Igneous Rock (Felsic)
igneous
Quartz Mineral
Silicon dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Gold Mineral
Native Gold (Au)
mineral
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Gneiss (Cobble)
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Granite
Intrusive igneous rock
igneous
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)
mineral
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
mineral