Quartz (likely milky/gray variety)
Quartz (SiO₂)
Mineral
Category
Synthetic Glass (Often Categorized As A Simulated Mineral)
Browse synthetic glass (often categorized as a simulated mineral) specimens identified by the Rock Identifier community.
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Agate (variety of Chalcedony)
Agate (SiO2)
mineral
Pumice
Vesicular volcanic glass
igneous
Chert (often called Flint in this variation)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Rhodonite
Rhodonite (MnSiO3)
mineral
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Rhodonite
Rhodonite (MnSiO3)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Rose Quartz
Rose Quartz (SiO2)
Mineral
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Pumice
Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)
Igneous
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Chert (Red/Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
metamorphic
Mica Schist
Mica Schist (predominantly composed of Muscovite or Biotite silicates)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Magnetite / Hematite mix (Iron Ore)
Fe3O4 (Magnetite) / Fe2O3 (Hematite)
mineral
Gneiss
Gneiss
metamorphic
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral