Basalt (Water-worn Pebble)
Mafic Volcanic Rock (High in Fe and Mg)
igneous
Category
Mineral, Often Found In Metamorphic Rocks But Also In Sedimentary And Igneous Rocks
Browse mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks specimens identified by the Rock Identifier community.
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Labradorite (Gray Tumbled)
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Green Aventurine
Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Marble
Recrystallized Limestone (CaCO3)
metamorphic
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz-Veined Mudstone
Argillite or Mudstone with Quartz Veining (SiO2 in Siliciclastic Matrix)
sedimentary
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Almandine Garnet in Schist Matrix
Almandine - Fe3Al2(SiO4)3
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Carnelian
Chalcedony (Silicon Dioxide / SiO2)
mineral
Chalcedony with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Gold in Matrix
Native Gold (Au)
mineral
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt with Quartz/Calcite Inclusions
Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)
igneous