Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Chert (Jasper variation)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Rough Garnet in Matrix
Almandine Garnet (Fe3Al2Si3O12)
mineral
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Schist
Schist (metamorphic rock)
metamorphic
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Wishing Stone (Quartz-veined Siltstone or Graywacke)
Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)
sedimentary
Pink Granite
Phaneritic Igneous Rock (high K-feldspar content)
igneous
Jasper (specifically Red Jasper/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Gabbro
Plutonic mafic rock
igneous
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Banded Chalcedony (Agate)
Chalcedony (SiO2) - Cryptocrystalline Quartz
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Milky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic