Sandstone
Arenite (SiO2 principal component)
sedimentary
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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Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Anthracite Coal
Anthracite (Carbon)
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Sapphire
Corundum (Al2O3) with iron and titanium impurities
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Mica (Muscovite)
Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2
mineral
Serpentine (Serpentinite)
Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)
metamorphic
Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Limonite Pseudomorph after Pyrite
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Conglomerate
Conglomerate (SiO2, CaCO3 dominant)
sedimentary
Limestone
Sedimentary Calcite (CaCO3)
sedimentary
Ruby
Corundum (Al2O3 with Chromium)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral/Sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Anthracite Coal
Anthracite (Carbon-based solid)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Lapis Lazuli
Lapis Lazuli (Aggregate of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic
Charoite
(K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4 · nH2O (Hydrated silicate of potassium, calcium, and sodium)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Serpentinite
Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Lapis Lazuli (in Matrix)
Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Siltstone River Rock
Siltstone (composed of silt-sized particles, silicate minerals)
sedimentary
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
mineral
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
mineral
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral