Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Granite Cobble
Felsic intrusive igneous rock (composition: SiO₂ with KAlSi₃O₈, NaAlSi₃O₈, and CaAl₂Si₂O₈)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt
igneous
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Mineral
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Basalt
Extrusive Mafic Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Coquina
Bioclastic Limestone
sedimentary
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Granodiorite
Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Schist (Graphite or Mica rich)
Crystalline Schist (often containing Muscovite, Biotite, or Graphite)
metamorphic
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Granite
Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Gabbro
Phaneritic Mafic Igneous Rock
igneous
Basalt
Basalt
igneous
River Cobbles (Basalt, Quartzite, and Sandstone mix)
Fluvial detritus (primarily SiO2, Plagioclase, and Pyroxene mix)
Mixed: Igneous and Sedimentary
Basalt Pebble
Basalt
igneous
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Que Sera Stone (Llanite)
Rhyolite containing blue quartz and feldspar
igneous
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)
sedimentary
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous