Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Laterite Gravel with Quartz
Ferruginous Laterite (Fe2O3·nH2O)
sedimentary
Basalt (Phaneritic or Diabase)
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Pegmatitic granite
Granite, quartz–feldspar–mica assemblage
igneous
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Vuggy Chert / Silicified Limestone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Vesicular basalt (likely weathered lava rock)
Basalt, predominantly calcium-rich plagioclase, pyroxene, and commonly olivine; vesicular texture from gas bubbles
igneous
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Vesicular basalt (probable)
Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Quartz-veined Greywacke
Silicon dioxide (SiO2) in Lithic Sandstone
sedimentary
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Weathered quartz-rich metamorphic rock, possibly quartzite
Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining
metamorphic
Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia
Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides
igneous
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Chert Nodule in Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Basalt with Scoria/Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Quartz-rich metamorphic rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz
metamorphic
Blue Sapphire
Corundum (Al2O3)
gemstone