Aragonite (Star Cluster or Twinned variety)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Category
Mineral Group
Browse mineral group specimens identified by the Rock Identifier community.
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Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
K-Feldspar (Microcline / Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Galena
Lead Sulfide (PbS)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Quartz with Mica
Silicon Dioxide (SiO2) with Mica group inclusions
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Schorl (Black Tourmaline)
Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodalite)
mineral
Gabbro
Phaneritic Mafic Igneous Rock
igneous
Spinosaurus aegyptiacus Fossil
Spinosaurus aegyptiacus (permineralized hydroxyapatite)
fossil
Dalmation Stone
Peralkaline Rock (Microcline Quartz mixture with Arfvedsonite)
igneous
Tumbled brown jasper
Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained
sedimentary
Basalt with Olivine Phenocrysts
Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)
Igneous
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Fossilized Gastropod Shell
Gastropoda (Fossilized internal mold or shell body)
fossil
New Jade (Serpentine)
Antigorite / Serpentine Group (Mg3Si2O5(OH)4)
metamorphic
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Fossil shark teeth
Likely fossilized shark teeth, possibly Carcharhiniformes or related sharks; exact species cannot be determined from the photo.
fossil
Green serpentine
Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Blue apatite (likely rough/tumbled specimen)
Apatite group, commonly fluorapatite — Ca5(PO4)3F
mineral
Ruby in Zoisite
Anyolite (Zoisite with Corundum) Member of the Epidote Group
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Eudialyte
Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Red Jasper and Mookaite Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Moqui Marble
Ironstone Concretion (Goethite/Hematite)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Pyrope Garnet (Bohemian Garnets)
Pyrope (from the group Mg3Al2(SiO4)3)
mineral
Milky Quartz Geode with Chlorite
Silicon Dioxide (SiO2) with Chlorite group inclusions
mineral
Garnet
Almandine-Pyrope group, X3Y2(SiO4)3
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenstone / Serpentinite
Serpentine-group / Altered Mafic Rock
metamorphic
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Jasper or Agate with Chlorite Inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals
sedimentary