Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)
mineral
Category
Mineral Group
Browse mineral group specimens identified by the Rock Identifier community.
Learn about Mineral Group in the encyclopedia
View all →
Eucrite Meteorite
Achondrite (Eucrite)
meteorite
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Slag
Metallurgical Slag
igneous
Dalmatian jasper
Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions
igneous
Fossilized Gastropod in Limestone
Gastropoda (Class) in Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Granitic Pegmatite with Schorl
Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
New Jade (Serpentine)
Antigorite / Serpentine group (Mg3Si2O5(OH)4)
metamorphic
Schorl (Black Tourmaline) in Quartz/Feldspar Matrix
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
igneous
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Chrysoprase
Nickel-bearing Chalcedony (SiO2 with Ni impurities)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Lapis Lazuli (Fragment)
Lazurite-rich metamorphic rock
metamorphic
Basalt River Stone
Aphanitic Mafic Igneous Rock
igneous
Tumbled jasper, likely picture or brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
gemstone
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Polished dark pebble, likely basalt
Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine or magnetite
igneous
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Quartz Veined Siltstone
Siltstone with Quartz (SiO2) intrusion
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Serpentine (Healerite variety)
Serpentine group, Mg3Si2O5(OH)4
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Amazonite
Amazonite (KAlSi3O8, a triclinic variety of Potassium Feldspar)
mineral
Quartz with Chlorite / Greenschist
Quartz vein in Greenschist (SiO2 with Chlorite group minerals)
metamorphic
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Basalt
Extrusive mafic igneous rock
igneous
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus), composed of CaCO3 (Aragonite/Calcite)
fossil
Basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3)
mineral
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Lapis Lazuli
Lapis lazuli (primary component: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Black Tourmaline in Quartz and Feldspar Matrix
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) with Quartz and Feldspar
igneous
Quartz / Feldspar Specimen
SiO2 (Quartz) / KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar Group)
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Spinifex Textured Komatiite
Ultramafic Komatiite
igneous
Spinifex Textured Komatiite
Komatiite (Mg-rich ultramafic volcanic rock)
igneous