Tiger's Eye (Rough)
SiO2 (Silicon Dioxide / Pseudomorph of Quartz after Crocidolite)
Mineral / Metamorphic
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Baltic Amber (Butterscotch variety)
Succinite
Organic Gemstone/Mineraloid
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Fossilized Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone
Arenite
sedimentary
Coquina Jasper
Fossiliferous Chalcedony (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Fossiliferous Limestone (Crinoidal)
Crinoid Limestone (CaCO3 with fossil biological remains)
sedimentary
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) - variety of Chert/Jasper
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Chondrite Meteorite
Stony Meteorite (Chondrite)
igneous
Fossilized Horn Coral
Rugosa
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite
Mineraloid
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Unakite
Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae within Microcrystalline Quartz)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral