Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Blue Quartzite
Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite), SiO2
metamorphic
Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebbles
Quartzite (SiO2 silicon dioxide dominant)
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Pegmatite (Granitic) with Tourmaline
Granitic Pegmatite (containing Schorl and Quartz)
igneous
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Slate
Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Glaucophane-bearing Schist (Blueschist)
Blueschist (Glaucophane-Lawsonite Schist)
metamorphic
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite (specifically Pink or Red Quartzite)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Mineral
Muscovite Mica in Quartz Matrix
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
mineral
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Mineral (silicate variety)
Muscovite (Mica) in Quartz Matrix
Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)
mineral
Anthracite Coal
Anthracite
metamorphic
Jasper containing epidote (Unakite-like)
Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Chiastolite (Andalusite)
Al2SiO5
metamorphic
Graphite
Graphite (Native Carbon, C)
metamorphic
Riverstone Quartzite / Chalcedony Nugget
Silicon Dioxide (SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
metamorphic
Graphite
Graphite (Native Carbon, C)
metamorphic
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Zebra Jasper (usually a trade name for Serpentine or Basalt blend)
Antigorite/Chrysotile (Serpentine family) - Mg3Si2O5(OH)4
metamorphic
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Quartzite (Iron-stained)
Quartzite (mostly SiO2 with Fe2O3 impurities)
metamorphic
Gold-bearing Quartz
Auriferous Quartz (SiO2 with Native Gold inclusion)
mineral
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (chromium-rich mica)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sodalite
Sodium aluminum silicate chloride (Na8(Al6Si6O24)Cl2)
mineral