Ammonite Fossil
Ammonoidea
fossil
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Learn about Organic (Non Rock) in the encyclopedia
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Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Calcium carbonate rock (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Gastropod Fossil
Gastropoda
fossil
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Unidentified weathered rock fragment
Indeterminate; possibly vesicular basalt or weathered volcanic rock
igneous
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Milky quartz with iron staining
Quartz (SiO₂)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Black volcanic rock (possibly obsidian or basalt)
Indeterminate from the image; candidates include volcanic glass (obsidian, SiO₂-rich) or basalt (plagioclase–pyroxene-rich)
igneous
Polished septarian nodule
Septarian concretion, commonly calcite/aragonite with brown calcite or barite veins in a limestone–clay matrix
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Chert (Jaspery variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert Concretion / Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Obsidian
Obsidian (Volcanic Glass)
igneous
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
River Rock (Quartzite)
Quartzite
metamorphic
Porphyritic volcanic rock, likely andesite
Porphyritic andesite; mainly plagioclase feldspar and volcanic groundmass, with possible hornblende or pyroxene
igneous
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Basalt
Mafic Igneous Rock (Basalt)
igneous
Quartzite
Metamorphic rock (primarily SiO2)
metamorphic
Apache Tear
Obsidian (Hydrated Silica Glass)
igneous
Siltstone
Siltstone (clastic sedimentary rock)
sedimentary