Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Category
Browse mineral in igneous rock specimens identified by the Rock Identifier community.
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
Amethyst
Amethyst (Silicon Dioxide, SiO2)
Milky Quartz (with trace inclusions)
Silicon Dioxide (SiO2)
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
Granite
Phaneritic Plutonic Felsic Rock
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Dragon Blood Jasper
Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))
Granodiorite (or Granite) Pebble
Phaneritic Felsic Igneous Pebble
Banded Gneiss
Gneiss (Metamorphic Rock)
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Granite
Granite (Felsic intrusive igneous rock)
Milky Quartz
Silicon Dioxide (SiO2)
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
Granite
Granite
Diorite
Diorite (Intermediate intrusive igneous rock)
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
Greenschist
Greenschist (chlorite-epidote schist)
Granodiorite
Granodiorite (intermediate plutonic rock)
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Granite
Intrusive igneous rock (Acidic)
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Granite Cobble
Phaneritic Felsic Igneous Rock
Granite
Granite
Granite
Intrusive igneous felsic rock
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
Granite
Granite
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
Diorite
Diorite (Intermediate intrusive igneous rock)
Labradorite (White/Grey Labradorite)
Labradorite: (Ca, Na)(Al, Si)4O8
K2 Jasper
Azurite in Granite
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
Milky Quartz
Silicon Dioxide (SiO2)
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
Milky Quartz (Common Quartz)
Quartz (Silicon Dioxide, SiO2)
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Pink Granite
Felsic intrusive igneous rock