Pyrite
Iron Disulfide (FeS2)
mineral
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pink Granite (Gneissic Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (Cut Gemstone)
Carbon (C)
mineral
Unakite
Epidotized Granite
metamorphic
Gneiss
Gneiss
metamorphic
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits
Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentinite (group of hydrous magnesium iron phyllosilicate minerals, e.g., Lizardite, Antigorite)
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
Rough Blue Sapphire
Corundum (Al2O3)
mineral
Schist with Quartz Vein
Mica Schist with Crystalline Quartz (SiO2)
metamorphic
Quartz (Rutilated)
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Sandstone
Arenite
sedimentary
Diorite (Salt and Pepper Rock)
Diorite
igneous
Pink Granite
Phaneritic intrusive igneous rock with Potassium Feldspar (KAlSi3O8) and Quartz (SiO2)
igneous
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Prase or Green Quartz
Silicon Dioxide (SiO2 with actinolite or chlorite inclusions)
Mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Travertine
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral