Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Coquina
Coquina (Bioclastic Limestone)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)
igneous
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
metamorphic
Septarian Nodule
Septarian Concretion (CaCO3, CaMg(CO3)2, SiO2)
sedimentary
Unakite
Unakite (Epidote-Feldspar rock)
Metamorphic rock
Lapis Lazuli
Lapis lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Basalt with Iron Oxidation
Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)
igneous
Basalt with Iron Oxidation
Extrusive mafic volcanic rock
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
metamorphic
Porphyritic Andesite
Andesite (with white Plagioclase phenocrysts)
igneous
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite (Weathered)
Granite (Felsic Plutonic Rock)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Coquina with Shell Fragment
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Diorite
Phaneritic intermediate intrusive igneous rock
igneous
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Granite (Thin Section)
Granite (Felsic Plutonic Rock)
igneous
Pink Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous