Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
Category
Browse metamorphic or sedimentary specimens identified by the Rock Identifier community.
Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartzite
Quartzite
Garnet
Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)
Pyrite
Iron Sulfide (FeS2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Lapis Lazuli (in Matrix)
Na8[Al6Si6O24]S2 (Lazurite as the primary component)
Ferruginous Quartzite (Iron-stained Quartzite)
Quartzite with Iron oxides (FeO(OH) / Fe2O3)
Unakite
Epidotized Granite
Quartzite
Quartzite (Mainly SiO2)
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
Quartzite
Quartzite (SiO2)
Schist
Mica Schist
Greenstone
Greenschist
Schist
Mica Schist
Mica Schist
Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)
Marble
Recrystallized Calcite (CaCO3)
Yellow Quartzite
Quartzite (SiO2)
Blue Quartzite
Quartzite with Dumortierite or Magnesio-riebeckite inclusions (SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2)
Marble
Crystalline Limestone (mostly CaCO3 / Calcium Carbonate)
Green Aventurine
Aventurine Quartz (SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2)
Quartzite
Silicon Dioxide (SiO2)
Quartzite
Quartzite (SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2 silicon dioxide)
Quartzite
Quartzite (SiO2)
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, epidote, actinolite)
Greenstone (Epidote/Chlorite Schist)
Metabasalt (composed primarily of Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH) and Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
Quartzite (River Cobble)
Quartzite (predominantly SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite River Rock
Quartzite (primarily SiO2)
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
Quartzite
Quartzite
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
Slate
Slate (Low-grade regional metamorphic rock)
Quartzite (Iron-stained River Rock)
Metamorphic Rock consisting primarily of Quartz (SiO2)
Red Quartzite
Metamorphic Rock (rich in SiO2 with hematite inclusions)
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)