Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Category
Igneous Rock (Volcanic Glass)
Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)
igneous
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Basalt with Peridotite (Olivine) Xenolith
Olivine-rich Peridotite (Dunite) xenolith in Vesicular Basalt; chemical formula (Mg,Fe)2SiO4
igneous
Porphyry
Porphyritic Andesite/Basalt
igneous
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Quartz
Quartz (SiO₂)
Mineral
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
igneous
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Labradorite (Feldspar)
Labradorite, (Ca,Na)(Al,Si)4O8
mineral
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Granite (Pink/Red)
Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Picture Jasper
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
metamorphic
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)
Porphyritic Basalt (likely Chinese Writing Stone)
Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony (SiO2)
igneous
Carnelian
Carnelian (a variety of Chalcedony, SiO₂)
Mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Larimar
Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))
Mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite Cobble
Granite (Felsic Intrusive)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous