Chert (Nodule)
SiO2 (Microcrystalline Quartz)
sedimentary
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Quartzite (River Cobble)
Metamorphic Quartz-rich Rock
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diabase (also known as Dolerite)
Diabase
igneous
Quartzite Pebble
Quartzite (SiO2 with minor impurities)
metamorphic
Granite
Granite (Phaneritic igneous rock)
igneous
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Chalcedony (Agate Nodules)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Coral Fossil (Favosites)
Favosites (Extinct genus of tabulate corals)
sedimentary
Chalcedony (Agate/Carnelian type)
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz Pebble (likely Chalcedony or Quartzite)
Silicon Dioxide (SiO2)
mineral
Basalt (River Pebble)
Extrusive Mafic Igneous Rock
igneous
Turquenite (Dyed Howlite)
Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)
mineral
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite (weathered cobble)
Granite
igneous
Quartz (possibly Citrine or Smoky Quartz variety)
Silicon Dioxide (SiO2)
mineral
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
mineral / metamorphic
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Chert / Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Porphyritic Rhyolite
Porphyritic Rhyolite (compositionally similar to granite)
igneous
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert / Pink Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Granitic Pegmatite
Pegmatite (composed primarily of Quartz, Feldspar, and Muscovite mica)
igneous
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized Coral (Petoskey Stone / Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Septarian Nodule Segment (Commonly known as Dragon Stone or Lightning Stone)
Septarian Nodule (CaCO3 / Hydrated Calcium Carbonate)
sedimentary
Quartzite Pebble
Quartzite (principally SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral