Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Siltstone with Weathering Rind
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 with Calcite, Aragonite, and Limestone/Bentonite)
sedimentary
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)
sedimentary
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Basalt with Red Inclusions
Aphanitic Mafic Igneous Rock (likely Basalt)
igneous
Sandstone with Manganese Dendrites/Oxide coatings
Arenite with Pyrolusite and Romanechite (MnO2)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Green Quartzite (Tumbled)
Metamorphosed Quartz-rich Sandstone
metamorphic
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil
Ferruginous Sandstone
Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)
sedimentary
Fossil Shark Tooth
Carcharocles or Lamniformes (order)
fossil
Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
fossil
Red Jasper (Silicate Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Ferruginous Quartzite (Iron-stained Quartz)
Quartzite (SiO2 with Fe-oxide staining)
metamorphic
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Quartz chunk
Silicon dioxide (SiO2)
mineral
Basalt with Weathered Crust
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Orange Aventurine (Sunstone-style Quartzite)
Silicon Dioxide (SiO2) with Goethite or Hematite inclusions
metamorphic
Coprolite
Coprolite (fossilized feces)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Plagioclase Feldspar
Plagioclase (NaAlSi3O8 - CaAl2Si2O8 series)
mineral
Siltstone with Iron Staining
Siltstone (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Porous Quartzite
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Basalt with Weathering Crust
Extrusive mafic volcanic rock
igneous