Clear Quartz Crystal
Silicon Dioxide (SiO2), Quartz
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Beach Pebble (Gray Quartzite / Fine-Grained Metasediment)
Quartzite (SiO2-dominated rock) / Metamorphic Sandstone
metamorphic
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Quartz nodule (River pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Hag Stone
Perforated Calcarenite or Chert
sedimentary
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz with Mica inclusions (likely Iron-stained)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
mineral
Black Obsidian
Volcanic Glass (Silicon Dioxide with impurities)
igneous
Colorless Gemstone (possibly Diamond or Cubic Zirconia)
C (Diamond) or ZrO2 (Cubic Zirconia)
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)
SiO2 with TiO2 inclusions (Quartz with Rutile)
Mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite
Agate (Water-Worn)
Cryptocrystalline quartz (SiO2)
sedimentary
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Diamond
Diamond (Carbon, C)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Heart-shaped Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pumice (Vesicular Lava)
Pumice
igneous
Rainbow Quartz (Dyed/Coated Quartz)
Silicon Dioxide (SiO2) with artificial color enhancement
gemstone
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica in Quartz Matrix
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary