Peridotite (Dunite)
Peridotite (comprising mainly Olivine)
igneous
Category
Mineral (Specifically A Mineraloid)
Browse mineral (specifically a mineraloid) specimens identified by the Rock Identifier community.
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Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Siltstone/Quartz variety)
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Basalt
Basalt
igneous
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Basalt
Aphanitic Mafic Igneous Rock
igneous
Basalt
Basalt (composition: Plagioclase, Pyroxene, and Olivine)
igneous
Chert (specifically Silex or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary
Jasper Conglomerate
Polymictic Conglomerate with Jasper and Quartz
sedimentary
Orthoceras Fossil Limestone
Orthoceras sp. (Calcium Carbonate, CaCO3)
sedimentary
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
metamorphic
Crazy Lace Agate
Chalcedony (SiO2 with inclusions)
sedimentary
Mookaite Jasper
Radiolarite (Silica with iron oxides like Goethite and Hematite)
sedimentary
Red Chert (Jasper)
Chert / Microcrystalline Quartz (SiO2)
sedimentary
Horn Coral Fossil
Order Rugosa
fossil
Jasper (Red/Green Brecciated)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Fossiliferous Limestone (Crinoidal)
Calcite-bearing bioclastic packstone (CaCO3)
sedimentary
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
Tiffany Stone
Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)
metamorphic
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2)
igneous
Flint (Chert variant)
Microcrystalline Quartz (SiO2)
sedimentary
Flint (Chert Nodules)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary (or mineraloid)
Rugose Coral Fossil
Rugosa (Order) / Horn Coral
fossil
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone (Chert/Clay mixed)
Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)
sedimentary
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Fossiliferous Limestone (Crinoidal Limestone)
Calcium Carbonate with Crinoid Stem Fossils (CaCO3)
sedimentary
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Red Jasper with Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Peridotite
Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)
igneous
Unakite
Unakite (Epidotized Granite)
metamorphic
Chert (or Microcrystalline Quartz)
Chert (Silicon Dioxide, SiO2)
sedimentary