Yellow Quartzite (Tumbled)
Quartzite (SiO2)
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Yellow Quartz (Citrine/Gold Quartz)
Silicon Dioxide (SiO2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Chert (variously known as Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Anthracite Coal
Anthracite (Metamorphosed Carbon)
sedimentary
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Banded Chert or Agate
Silicon Dioxide (SiO2)
sedimentary
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary
Conglomerate
Conglomerate
sedimentary
Chalcedony (specifically Agate or Carnelian)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Tiger's Eye
SiO2 (Quartz with inclusion of iron oxides)
mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Red Jasper (Skull Carving)
Jasper, a cryptocrystalline variety of Quartz (SiO2)
sedimentary
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Anthracite Coal
Anthracite (Metamorphosed Bituminous Coal)
sedimentary
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Milk Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
metamorphic
Amazonite
Amazonite (Microcline Feldspar) K(AlSi3O8)
mineral
Milky Quartz
Quartz (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary