Pink Quartzite
Quartzite (primarily 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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Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Fossilized Brachiopod/Bivalve in Limestone
Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)
sedimentary
Ironstone (Limonite/Hematite concretion)
Ferruginous Siltstone / Goethite (FeO(OH))
sedimentary
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)
metamorphic
Milky Quartz
Quartz (SiO₂)
Mineral
Chalcedony Nodule (Carnelian/Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Whetstone (Arkansas Stone)
Novaculite (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (composed primarily of SiO2 with various lithic fragments)
sedimentary
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Coprolite
Coprolite
sedimentary
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Jasper (Red/Brown Variety)
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Gastropod Fossil (Snail Internal Cast)
Class Gastropoda (Steinkern)
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Mineral
Agate (Geode/Nodule)
Chalcedony (cryptocrystalline silica, SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Clear Quartz Cluster
Quartz (Silicon Dioxide - SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Muscovite (Mica)
Muscovite - KAl2(AlSi3O10)(OH)2
Mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Conglomerate
Conglomerate
sedimentary
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Amethyst
SiO2 (Silicon Dioxide)
Mineral