Rutilated Quartz
SiO2 with TiO2 inclusions
Mineral
Category
Organic Gemstone (Not A Rock Or Mineral)
Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Clear Quartz (Double Terminated)
Silicon Dioxide (SiO2)
mineral
Peridotite (Olivine/Peridot)
Peridotite: (Mg,Fe)2SiO4 (Olivine-rich ultramafic rock)
igneous
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Chert (varietal Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Peridotite (Olivine)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Basalt
Basalt (extrusive igneous rock)
Igneous
Red Jasper (Heliotrope family variant)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Granite
Granite (Felsic intrusive igneous rock)
igneous
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Chert (Flint Nodules)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Unakite
Unakite (Episyenite composition: Feldspar, Epidote, and Quartz)
metamorphic
Unakite
Unakite Lepidolite
metamorphic
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Dalmatian Jasper (or Dalmatian Stone)
Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)
igneous
Obsidian
Amorphous Volcanic Glass (primarily SiO2)
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Banded Chert (Agate-like Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Unakite
Epidotized Granite
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous