Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Granite
Granite
Igneous
Gneiss
Gneiss
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Granite
Intrusive Igneous Rock
igneous
Granite and Porphyry Pebbles
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
River Rock (Greywacke/Sandstone)
Arenite / Lithic Sandstone
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Weathered brown mineralized rock
Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing
metamorphic
Basalt with Weathering Rind
Basalt (Mafic Volcanic Rock)
igneous
Quartzite with Druzy Quartz
Silicon Dioxide (SiO2)
metamorphic
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Granite
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Black granite with pink feldspar
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Dark fine-grained river pebble, likely basalt or diabase
Basaltic rock; chiefly plagioclase feldspar and pyroxene, with possible magnetite
igneous
Schist
Mica Schist
metamorphic
Turquoise in Matrix
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Weathered granite-like rock
Granite, likely biotite-bearing; exact identification is uncertain from the image
igneous
Serpentine
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Sandstone Concretion
Sedimentary concretion
Sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Quartz Pebble (with Feldspar/Mica)
Granitic Quartz / SiO2 with KAlSi3O8
igneous
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Emerald (or possibly Green Glass / Slag)
Beryl (Be3Al2(SiO3)6)
gemstone
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Quartz Veined Siltstone
Siltstone with Quartz Intrusion (SiO2)
sedimentary
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Microcline Feldspar (Amazonite or White Feldspar)
KAlSi3O8
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic