Sandstone
Arenite
sedimentary
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Learn about Mineral Composite in the encyclopedia
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Galena
Lead sulfide (PbS)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
sedimentary
Biotite-rich gneiss (probable)
Foliated quartz–feldspar–biotite gneiss; composition commonly includes quartz (SiO₂), feldspar, and biotite mica
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Geode / Ironstone Concretion
Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite (Ironstone) pseudomorph
Limonite (Hydrous ferric oxide), FeO(OH)·nH2O
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Quartz-rich Diorite
Diorite (Phaneritic intermediate igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Granodiorite
Granodiorite
igneous
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Native Copper in Basalt
Cuprum (with Host Basalt)
igneous
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Sandstone Pebble
Quartz Sandstone
sedimentary
Sandstone
Arenite
sedimentary
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Granite Pebble
Intrusive Igneous Rock (Granite)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Conglomerate
Conglomerate
Sedimentary Rock
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Granite Pebble
Granite
igneous
Banded gneiss pebble
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic