Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Granite
Phaneritic intrusive igneous rock
igneous
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Conglomerate
Conglomerate
Sedimentary
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Magnetite-rich Iron Ore
Magnetite (Fe3O4)
mineral
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Granite Cobble
Granite
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite river rock
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Gneiss
Gneiss
metamorphic
Coquina
Bioclastic Limestone
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic extrusive igneous rock)
igneous
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Calcite
Calcite (CaCO3)
Mineral
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Aventurine
Quartz (Aventurine variety)
Mineral
Schist (Garnet-Mica Schist)
Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)
metamorphic
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Sandstone
Arenite
sedimentary
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Greenschist
Chlorite Schist
metamorphic
Schist
Schist (various mineral compositions)
metamorphic
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Granite
Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Greenschist / Migmatite
Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)
metamorphic
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
metamorphic
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral