Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Basalt
Mafic Igneous Basalt
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt River Stone
Basaltic Igneous Rock
igneous
Red Tiger's Eye
Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)
metamorphic
Granite
Phaneritic plutonic rock (SiO2 range 65-75%)
igneous
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite or Magnetite inclusions (SiO2 + Fe2O3)
igneous
Granite
Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Granite
Phaneritic Felsic Intrusive Rock
igneous
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (a plutonic rock)
Igneous
Arsenopyrite with Quartz
Arsenopyrite (FeAsS)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ impurities)
mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Blue Quartzite
Quartzite (specifically a variety enriched with blue-coloring minerals)
Metamorphic Rock
Yellow Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 or Jadeite: NaAlSi2O6
metamorphic
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Olivine in Basalt matrix
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
igneous
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous