Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions)
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Silty Shale or Mudstone
Siltstone/Mudstone (Clastic Sedimentary Rock)
sedimentary
Green aventurine (tumbled)
Quartz, SiO₂, with fuchsite or other mica inclusions
mineral
Sandstone pebble
Sandstone (arenite / quartzarenite)
sedimentary
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Slate
Slate (Metamorphic Rock)
metamorphic
Red Jasper or Ferruginous Chert
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Rounded granite pebble
Granite, chiefly quartz, feldspar, and mica; approximate composition SiO₂-rich felsic rock
igneous
Quartzite
Metamorphosed Sandstone (Mainly SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone with Liesegang Rings
Liesegang-banded Sandstone
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (Sedimentary Rock)
fossil
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartzite (Pink/Red variety)
Quartzite (SiO2 with iron oxide impurities)
metamorphic