Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
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Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic
Chert (Flint variety)
Chert (SiO2)
sedimentary
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartzite
Quartzite (composed primarily of silica, SiO2)
metamorphic
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusion of AlAl6BSi3O18
mineral
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Greenschist
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Basalt (Greenstone)
Amygdaloidal Basalt / Chloritized Basalt
Igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Unakite
Granitic rock composed of orthoclase, epidote, and quartz
metamorphic
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)
metamorphic
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic