Greenschist
Chlorite schist
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Schist
Schist (primarily mica-schist)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Granite
igneous
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)
Epidote with Black Hornblende and White Quartz mixture
metamorphic
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Mica Schist
Mica Schist
metamorphic
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diorite
Diorite (an intrusive igneous rock)
igneous
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Orange Quartzite / Carnelian Agate
Silicon Dioxide (SiO2)
metamorphic
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Unakite (Tumbled)
Unakite (altered granite)
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Quartz Druzy on Matrix (with Copper Mineralization)
Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)
mineral
Jadeite Jade
Sodium Aluminum Silicate (NaAlSi2O6)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Diorite
Diorite (plutonic igneous rock)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
White Jade / Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Granite (Background) and Quartzite/River Pebble (Foreground Heart)
Phaneritic Felsic Igneous Rock (Granite background)
igneous
Basalt (River Pebble)
Basalt (extrusive mafic rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Chlorite Included Quartz
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Li)6AlSi3O10(OH)8
mineral