Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Granodiorite
Phaneritic Plutonic Intermediate-Felsic Rock
igneous
Rough Blue Sapphire
Corundum (Al2O3)
mineral
Gneiss
Gneiss
metamorphic
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Graphite
Graphite (Carbon, C)
Mineral
Demantoid Garnet on Matrix
Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Quartzite Pebbles (Sugar Quartz)
Metamorphic Quartzite (SiO2)
metamorphic
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Fossilized Favosites (Honeycomb Coral)
Favosites (extinct genus of tabulate coral)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Unakite
Epidotized Granite
metamorphic
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Unakite
Epidotized Granite
metamorphic
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix
metamorphic
Quartzite
Quartzite (mainly SiO2)
metamorphic
Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)
metamorphic
Epidote (likely Pistacite in Epidosite rock)
Epidote: Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic