Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Tourmalinated Quartz
Silicon Dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
mineral
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Gneiss
Gneiss
metamorphic
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Dendritic Opal
Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide coatings)
sedimentary
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Mineral
Clear Quartz (Tumbled)
Quartz (Silicon Dioxide - SiO2)
mineral
Septarian Nodule with Calcite
Septarian Concretion (CaCO3 with internal calcite crystals)
sedimentary
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Septarian Nodule
Septarian Concretion (CaCO3 / Fe2O3 / SiO2)
sedimentary
Zebra Jasper
Impure variety of Silica (SiO2)
sedimentary
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Rose Quartz with Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
French Bulldog (Blue Variety)
Canis lupus familiaris
Organic (Biological Organism)
Blue Quartzite (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebbeckite
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Rutilated Quartz (or Tourmalinated Quartz if inclusions are Tourmaline)
Silicon Dioxide (SiO2) with Rutile (TiO2) or Tourmaline inclusions
Mineral
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Greenstone
Greenschist / Greenstone (Chlorite-Epidote facies)
metamorphic
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Granite
Intrusive Felsic Igneous Rock
igneous