Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Pink Granite
Felsic intrusive igneous rock
igneous
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Slate
Foliated Metamorphic Rock (composed mainly of clay minerals or micas)
metamorphic
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Quartz (specifically Milky/Gray Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Granite
Granite (Felsic Plutonic Rock)
Igneous
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Greenstone / Serpentinite
Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Ventifact
Eolian Ventifact (often composed of basalt, chert, or quartzite)
sedimentary
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Unidentifiable Rock Fragment
Uncertain
Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
igneous
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Sandstone (Quartzose Pebble)
Clastic Sedimentary Rock (Litharenite/Quartz arenite)
sedimentary
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic