Rock Identifier

Category

Igneous Rock (Volcanic Glass)

Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.

Massive Quartz (Milky or Gray) (Silicon Dioxide (SiO2)) — mineral

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

mineral
Gold-bearing Quartz with Iron Oxides (Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)) — mineral

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

mineral
Peridot (likely, given the color and bead form) (Olivine, variety Peridot (Mg,Fe)2SiO4) — Mineral

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4

Mineral
Wishing Stone with Quartz Veins (Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)) — metamorphic

Wishing Stone with Quartz Veins

Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)

metamorphic
Pegmatite (Granite Pegmatite) (Intrusive Igneous Rock (Granite Pegmatite)) — igneous

Pegmatite (Granite Pegmatite)

Intrusive Igneous Rock (Granite Pegmatite)

igneous
Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

sedimentary
Chert (Iron-Stained) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)

sedimentary
Pink Granite (Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

igneous
Quartz (Milky/Granular) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

mineral
Muscovite Mica (Muscovite (KAl2(AlSi3O10)(F,OH)2)) — mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

mineral
Granodiorite (River Pebble) (Granodiorite) — igneous

Granodiorite (River Pebble)

Granodiorite

igneous
Muscovite Mica (Muscovite - KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

mineral
Granite (Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)) — igneous

Granite

Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)

igneous
Feldspar Granodiorite (Granodiorite (Na,Ca)(Si,Al)4O8) — igneous

Feldspar Granodiorite

Granodiorite (Na,Ca)(Si,Al)4O8

igneous
Olivine (Peridot) (Olivine (Mg, Fe)2SiO4) — mineral

Olivine (Peridot)

Olivine (Mg, Fe)2SiO4

mineral
Granite (Phaneritic Intrusive Igneous Rock (Granite)) — igneous

Granite

Phaneritic Intrusive Igneous Rock (Granite)

igneous
Granite (Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)

igneous
Dalmatian Stone (Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock) — igneous

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

igneous
Leopardskin Jasper (Jasper (a variety of microcrystalline Quartz)) — Sedimentary

Leopardskin Jasper

Jasper (a variety of microcrystalline Quartz)

Sedimentary
Amethyst (Quartz variety; SiO2 (Silicon Dioxide)) — Mineral

Amethyst

Quartz variety; SiO2 (Silicon Dioxide)

Mineral
Blue Lace Agate (Silicon Dioxide (SiO2) - Variety of Chalcedony) — mineral

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

mineral
Carnelian (SiO2 (Silicon Dioxide) - Carnelian Agate/Chalcedony) — mineral

Carnelian

SiO2 (Silicon Dioxide) - Carnelian Agate/Chalcedony

mineral
Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

metamorphic
Granite (Granite (a felsic intrusive igneous rock)) — Igneous

Granite

Granite (a felsic intrusive igneous rock)

Igneous
Granodiorite (Granodiorite (Intermediate plutonic rock)) — igneous

Granodiorite

Granodiorite (Intermediate plutonic rock)

igneous
Amethyst Geode (Silicon Dioxide with impurities (SiO2)) — mineral

Amethyst Geode

Silicon Dioxide with impurities (SiO2)

mineral
Pink Tourmaline (Rubellite) (Elbaite (Tourmaline group) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) — mineral

Pink Tourmaline (Rubellite)

Elbaite (Tourmaline group) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

mineral
Muscovite Mica (KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

mineral
Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

sedimentary
Fossil Coral (Scleractinia (fossilized calcium carbonate)) — sedimentary

Fossil Coral

Scleractinia (fossilized calcium carbonate)

sedimentary
Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral
Gneiss (with Mica and Quartz) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

metamorphic
Quartz Vein in River Siltstone (Crystalline Quartz (SiO2) in Siliclastic Matrix) — sedimentary

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

sedimentary
Fulgurite (Liesegang (Fulgurite)) — Mineraloid

Fulgurite

Liesegang (Fulgurite)

Mineraloid
Orbicular Granite (Orbicular Granidiorite / Plutonic Igneous Rock) — igneous

Orbicular Granite

Orbicular Granidiorite / Plutonic Igneous Rock

igneous
Geodude (Geodude (Rock Pokémon: No. 74)) — igneous

Geodude

Geodude (Rock Pokémon: No. 74)

igneous
Basaltic Scoria (Scoria (Vesicular Basalt/Andesite)) — igneous

Basaltic Scoria

Scoria (Vesicular Basalt/Andesite)

igneous
Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

sedimentary
Fulgurite (Luechatelierite (SiO2 glass)) — mineraloid

Fulgurite

Luechatelierite (SiO2 glass)

mineraloid
Sodalite (Sodalite Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite Na8(Al6Si6O24)Cl2

mineral
Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

mineral
Pyrulite (Pyrite / Chalcopyrite) (Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)) — mineral

Pyrulite (Pyrite / Chalcopyrite)

Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)

mineral