River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Category
Organic (Non Geological)
Browse organic (non geological) specimens identified by the Rock Identifier community.
Amber
Succinite (Approximate formula: C10H16O)
mineral
Pale stone fragment (likely limestone)
Likely calcite-rich limestone (CaCO₃); the image is insufficient for a definitive identification
sedimentary
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Coprolite
Fossilized Feces
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Rounded brown river pebble
Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt
sedimentary
Anthracite Coal
Anthracite
sedimentary
River Pebble (likely Quartzite or Diorite)
Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock
metamorphic
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Smooth River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chalcopyrite
CuFeS2
mineral
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Desert Rose Fragment (Atypical) / Weathered Chert
Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy
sedimentary
Faceted gemstone in a jewelry setting
Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone
gemstone
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
organic material
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Emerald and diamond ring
Emerald: beryl, Be3Al2Si6O18, colored green by chromium and/or vanadium; surrounding stones appear to be diamonds, crystalline carbon (C)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Anthracite
Anthracite Coal
sedimentary
Small tumbled brown stone, likely iron-stained quartz or jasper
Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass, complex silicate)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Polished leopard-skin jasper
Orbicular jasper; microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions
mineral
Red faceted gemstone ring
Likely synthetic ruby or red spinel; exact identification requires testing
gemstone
Black Obsidian
Volcanic Glass (SiO2)
igneous