Petrified Wood
Silicified Wood (SiO2)
metamorphic
Category
Anthropogenic (Human Made) Sedimentary Like Material
Browse anthropogenic (human made) sedimentary like material specimens identified by the Rock Identifier community.
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Uraninite (Pitchblende)
Uranium dioxide (UO2)
mineral
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Amber
Succinite (C10H16O)
mineraloid
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Diorite (Spotted or Dalmatian Stone pattern)
Diorite
igneous
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Mineral
Red Quartzite / Ferruginous Quartzite
Quartzite (primarily SiO2 with Fe2O3 inclusions)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Coquina / Fossiliferous Limestone
Fossiliferous Calcarenite (Calcium carbonate, CaCO3)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
mineral
Conglomerate
Conglomerate (SiO2 matrix with various silicate clasts)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Amazonite
Amazonite (KAlSi3O8, a triclinic variety of Potassium Feldspar)
mineral
Sunstone
Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)
mineral
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Diorite
Diorite
igneous
Tree Agate
Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides
mineral