Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Granite (Pink/Red variety)
Felsic Intrusive Igneous Rock
igneous
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
igneous
Ironstone Concretion
Ferruginous Sandstone / Siderite Concretion
sedimentary
Granite with Quartz Vein
Phaneritic intrusive igneous rock (Felsic)
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Pink Granite
Granite (rich in Potassium Feldspar/Orthoclase)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (specifically Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous
Sandstone (specifically Lithic or Quartz Arenite)
Arenite (composed primarily of SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
igneous
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
mineral
Larimar
NaCa2Si3O8(OH)
gemstone
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Chalcedony (specifically Agate or Carnelian pebble)
Chalcedony (Microcrystalline Quartz, SiO2)
mineral
Pink Granite
Granite (Phaneritic felsic intrusive igneous rock)
igneous
Greenschist
Chlorite-actinolite schist
metamorphic
Aventurine (specifically Green Aventurine)
Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2
metamorphic
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic plutonic igneous rock (typically 20% to 60% quartz by volume)
igneous
Pink Granite
Granite (composed of Potassium Feldspar, Quartz, and Plagioclase)
igneous
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Quartz (specifically Clear and Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Coarse-grained Granite (KAlSi3O8 + SiO2)
igneous
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone (specifically Double Arch in Arches National Park)
Entrada Sandstone
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary