Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
Category
Browse mineral, specifically a variety of quartz specimens identified by the Rock Identifier community.
Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
Basalt
Basalt (composition: Plagioclase, Pyroxene, and Olivine)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
Chert (Chert / Flint nodule)
Silicon Dioxide (SiO2)
Gowganda Tillite (Puddingstone)
Glacial Diamictite (Gowganda Formation)
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
Amazonite
Potassium Feldspar (KAlSi3O8)
Peridot
Olivine (Mg, Fe)₂SiO₄
Chert (White/Gray variety)
Chert (SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Amethyst (Rose de France varieties or Amethystine Quartz)
Silicon Dioxide (SiO2) with iron impurities
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
Chert (White/Light Tan)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Yellow Chert (River Stone/Pebble)
Chert (Cryptocrystalline Quartz, SiO2)
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
Chert (Quartz Variety)
Chert (SiO2)
Chert (Quartz Variety)
Chert (mostly SiO2 / Silicon Dioxide)
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
Gold in Quartz
Hydrothermal Quartz with Native Gold (SiO2 with Au)
Pyrite on Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron impurities)
Chert (Nodule)
Chert (primarily Microcrystalline Quartz - SiO2)
Jasper Pebble
Tumbled Jasper (Microcrystalline Quartz, SiO2)
Chert (Flint variety)
Silicon Dioxide (SiO2)
Chert (Flint variety)
Chert (SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Rutilated Quartz (beads)
SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))
Jasper (specifically Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Obsidian (Apache Tear)
Volcanic Glass (SiO2)
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)