Petrified Wood
Silicified Wood (SiO2)
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Limonite-stained Quartzite
Quartzite with Limonite (FeO(OH)·nH2O) staining
metamorphic
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Unakite
Epidotized Granite (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Unakite
Unakite (Metasomatized Granodiorite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Diorite
Diorite
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Gravel Pebble (Likely Quartzite or Basalt)
Quartzite (or Macrocrystalline Quartz)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Sandstone (Fluvial Pebble)
Arenite
sedimentary
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Granite (Orthoclase rich)
Granite (composed primarily of Quartz and Potassium Feldspar KAlSi3O8)
igneous
Chert (within Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Quartzite (Golden Quartz)
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Septarian Nodule (Galt)
Calcareous concretion / Septarian concretion
sedimentary
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
Greisen
Greisen
Metamorphic
Milky Quartz with Nephrite Jade
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2
mineral/metamorphic
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous