Milky quartz cluster
Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
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Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
Red Sandstone
Sandstone (lithic arenite / ferruginous sandstone)
sedimentary
Sandstone
Arenite
Sedimentary
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Polished brown jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety
mineral
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Quartz Pebble in Arkosic Sand
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica; Chemical formula: SiO2 + K(Al,Cr)2AlSi3O10(OH)2
metamorphic
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial purple dye
mineral
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Black Tourmaline (Schorl)
NaFe2+3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Green Aventurine
Quartz (Silicon Dioxide) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Turquoise (likely stabilized or Howlite/Magnesite imitation)
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Amethyst crystal cluster
Amethyst, purple quartz (SiO₂) colored mainly by iron impurities and irradiation
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Diamond
Diamond (C)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Bornite (Peacock Ore)
Cu5FeS4 (Copper Iron Sulfide)
mineral
Purple Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
gemstone
Red Sandstone
Ferruginous Sandstone
sedimentary
Granite
Granite (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous