Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
Learn about Mineral And Metamorphic Rock in the encyclopedia
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz/Feldspar Vein
Quartz-Feldspathic Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Common Quartz Pebble
Silicon dioxide (SiO2) rock fragment
sedimentary
Greenstone / River Jadeite pebble
Metavolcanic rock / Chlorite or Actinolite-rich schist
metamorphic
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Moonstone
Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Agate (Laguna or Lace variety pattern)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Prehnite
Prehnite Ca2Al2Si3O10(OH)2
mineral
Slate
Slate (Low-grade regional metamorphic rock)
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Banded Marble
Recrystallized Calcite (CaCO3)
metamorphic
Biotite-rich schist (mica schist)
Mica schist; predominantly biotite mica, quartz, and feldspar
metamorphic
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Schist
Mica Schist
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Migmatite
Migmatite (Mixed metamorphic-igneous rock)
metamorphic
Weathered quartz-bearing rock, possibly sandstone or quartzite
Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Gneiss
Gneiss
metamorphic
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Green Quartzite (Tumbled)
Metamorphosed Quartz-rich Sandstone
metamorphic
Gneiss
Gneiss
metamorphic
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
Sapphire
Corundum (Al2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and attached host material
mineral