Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Category
Organic (Non Geological)
Browse organic (non geological) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Ironstone Concretion / Limonite Node
Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)
sedimentary
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with impurities of Hematite or Goethite
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Banded Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Unakite
Epidote-Feldspar rock (specifically, a variety of granite)
Metamorphic rock
Granite
Granite (a felsic intrusive igneous rock)
Igneous rock
Granite
Granite (a felsic intrusive igneous rock)
igneous
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Chert (specifically a stream-worn Chert Nodule)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Red Amber (Burmite/Cherry Amber)
Succinite / Retinite (Organic Fossilized Resin, C10H16O)
Mineraloid (Organic)
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Granite
Granite (a plutonic igneous rock)
Igneous
Calcite
Calcite (CaCO3)
Mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Sedimentary
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Coal (specifically Bituminous or Anthracite)
Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Amber
Succinite
Organic (Mineraloid)
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Amber
Succinite (fossilized resin)
Organic Mineraloid
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Biotite Schist
Biotite Schist
Metamorphic
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary