River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Category
Mineral (Specifically A Variety Of Quartz)
Browse mineral (specifically a variety of quartz) specimens identified by the Rock Identifier community.
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Quartzite (Ferruginous)
Recrystallized Quartz (SiO2) with Iron Oxide inclusions
metamorphic
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate (specifically Lake Superior Agate or similar)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Crazy Lace Agate
Silicon dioxide (SiO2) - a variety of banded Chalcedony (cryptocrystalline quartz)
mineral
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Mammoth Tooth Fragment
Mammuthus primigenius (fossilized dentin and enamel)
sedimentary
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Apache Tear
Obsidian (Hydrated Volcanic Glass)
igneous
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Common Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalky variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Cryptocrystalline quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Basanite variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Novaculite Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (specifically Chert Nodule/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
sedimentary
Chert (Quartz Variety)
Chert (SiO2)
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral