Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Category
Mineral, Metal (Element)
Browse mineral, metal (element) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)
Mineral
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Ruby
Corundum (Al2O3 with Chromium trace elements)
mineral
Fossiliferous Shale (with Vertebrate Bones)
Laminated Mudstone containing Fossilized Bone (Apatite)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Amethyst Geode
Silicon Dioxide (SiO2) with trace Iron (Fe3+) impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Sodalite
Sodium aluminum silicate chloride (Na8(Al6Si6O24)Cl2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Raw Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Granite
Granitic intrusive igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)
igneous
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Rose Quartz
Silicon Dioxide with trace elements (SiO2 + Ti, Fe, or Mn)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz in Matrix (Pegmatite)
Silicon Dioxide (SiO2) with Potassium Feldspar and Biotite mica
igneous
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Sapphire
Corundum (Al₂O₃) with trace elements causing color variations.
Mineral
River Rock
Sedimentary Rock (various compositions)
sedimentary
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock