Schorl (Black Tourmaline) in Granite
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
igneous
Category
Metamorphic Rock (For Both Nephrite And Jadeite)
Browse metamorphic rock (for both nephrite and jadeite) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (For Both Nephrite And Jadeite) in the encyclopedia
View all →
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amphibolite
Amphibolite
metamorphic
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Polished green serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite and/or lizardite; bowenite is a compact, nickel-bearing serpentine variety
metamorphic
Pyrite
Pyrite (FeS2)
Mineral
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Greenstone
Greenschist
metamorphic
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Quartz (River Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Obsidian (principally SiO2)
igneous
Yellow Jade (Nephrite or Quartzite variety)
Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)
metamorphic
Tiger's Eye (Blue-Gold transition)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
Beach Pebbles and Quartz Aggregates
Quartz / Calcite Beach Pebbles (SiO2 / CaCO3)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (mainly SiO2)
Igneous
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Porphyritic basalt (likely amygdaloidal basalt)
Basaltic rock dominated by plagioclase feldspar and pyroxene, with possible vesicle-filling zeolite/calcite
igneous
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Polished quartz-rich pebble, possibly gold-bearing quartz vein material
Quartz (SiO₂) with probable iron-oxide staining and metallic sulfide inclusions
mineral
Rough Quartz (with potential Host Rock)
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Schist (likely Mica Schist)
Mica Schist
metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Ruby in Zoisite
Anyolite (composite of Corundum and Zoisite)
metamorphic
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Gneiss (with Quartz Vein / Pegmatite Banding)
Metamorphic Gneiss
metamorphic
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic