Carnelian
Carnelian Agate (SiO2)
mineral
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Geode
Crystalline Quartz in Sedimentary Matrix (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Black Obsidian
Extrusive Volcanic Glass (primarily SiO2)
igneous
Botryoidal Chalcedony (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Arenite
Sedimentary
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Riverstone Jasper (Chert variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone
Arenite (Silicon Dioxide with various mineral cements)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granodiorite
Granodiorite
igneous
Granite or Granodiorite (Weathered)
Granite
Igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Blue Quartz (Blue Aventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Fossilized Dinosaur Bone
Perineralized Bone (Fluorapatite/Quartz replacement)
fossil
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite/Goethite inclusions (SiO2 + Fe2O3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil