Likely serpentinite
Serpentinite, composed mainly of serpentine-group minerals (such as antigorite or chrysotile)
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica)
metamorphic
Greenschist / Serpentinite Cobble
Greenschist (composed primarily of chlorite, actinolite, and epidote)
metamorphic
Granite
Granite
igneous
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Banded gneiss (polished/tumbled cobble)
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Polished tiger iron
Tiger iron: banded quartz–crocidolite/jasper–hematite rock
metamorphic
Lapis Lazuli
Complex rock composed mainly of lazurite, calcite, and pyrite
gemstone
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Amphibolite
Amphibolite, composed mainly of amphibole (commonly hornblende) and plagioclase feldspar
metamorphic
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Banded Quartzite or Gneissic Pebble
Quartzite with mafic inclusions (SiO2) or Banded Gneiss
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
sedimentary
Schist
Mica Schist
metamorphic
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
metamorphic
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Serpentinite
Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)
metamorphic
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Slate
Foliated Metamorphic Rock (composed of quartz, illite, and chlorite)
metamorphic
Foliated amphibolite (likely augen or spotted amphibolite)
Amphibolite, composed chiefly of hornblende and plagioclase; exact identification requires close examination
metamorphic
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Serpentinite
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary