Geode (unopened)
Calcedony-lined Geode (SiO2)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Unakite
Epidotized Granite
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Granite
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with Crocidolite or Magnesio-riebeckite inclusions
metamorphic
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Indigo Gabbro (also known as Mystic Merlinite)
Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)
igneous
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Tree Agate
Dendritic Chalcedony (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
River Pebble (Gabbro or Basalt)
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)
metamorphic
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Gneiss
Gneiss
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Unakite
Epidotized Granite
metamorphic
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
sedimentary
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Red Shale
Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Dalmatian Jasper
Peralkaline rhyolite
igneous
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Igneous
Blue Quartzite
Silicon Dioxide (SiO2) with inclusions
metamorphic
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Orbicular Granite
Orbicular Granidiorite / Plutonic Igneous Rock
igneous
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic