Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist
metamorphic
Clear Quartz (Cut/Faceted Gemstone)
Silicon Dioxide (SiO2)
gemstone
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic
Mica Schist with Pyrite and Quartz
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sapphire
Corundum (Al2O3)
gemstone
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Dragon Blood Jasper
Epidote-containing Quartz Chalcedony (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Dragon Blood Jasper (Epidote with Piedmontite or Quartz)
Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
metamorphic
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss
metamorphic
Aventurine
Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)
metamorphic
Coarse-grained granite or granitic gneiss
Granite; primarily quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Tumbled Gray Agate
Silicon Dioxide (SiO2)
mineral
Moonstone (Feldspar)
Orthoclase feldspar, (K,Na)AlSi3O8
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Banded Gneiss
Gneiss
metamorphic
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Gneiss (with Quartzite and Mica)
Gneiss
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Schist
Mica Schist (primarily composed of quartz, feldspar, and mica)
metamorphic
Gneiss
Gneiss
metamorphic
Quartzite
Metamorphic rock consisting largely of Quartz (SiO2)
metamorphic
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary