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Recent Rock Identifications
Explore rocks, minerals, and gemstones recently identified by our AI-powered system
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Native Gold (Placer Gold)
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Granite River Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diabase (also known as Dolerite)
Diabase
igneous
Gabbro
Gabbro (mafic intrusive igneous rock)
igneous
Basalt (with possible Olivine inclusions)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
sedimentary
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (often called Jasper in this color variety)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Chlorite/Moss Infusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Chert (Nodule)
Crystalline Silicon Dioxide (SiO2)
sedimentary
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Basalt
Extrusive mafic volcanic rock
igneous
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Basalt Scoria
Vesicular Basalt
igneous
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Anthracite Coal
High-rank coal (primarily Carbon, C)
metamorphic
Shale
Laminated Mudstone
sedimentary
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Basalt
Basalt
igneous
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Rough Sapphire
Corundum (Al2O3)
mineral
Basalt (with possible iron oxide staining)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
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