Diamond
Carbon (C)
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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Black Agate
Chalcedony (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Corundum (Sapphire)
Corundum (Al2O3)
mineral
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Granite (Light-colored quartz/feldspar variety)
Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Diamond
Carbon (C)
gemstone
Shale with Siltstone layering
Sedimentary Clastic Rock (Mudstone/Shale)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Peacock Ore
Bornite (Cu5FeS4)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Rough Diamond
Diamond (C)
mineral
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Strawberry Quartz (or Hematoid Quartz)
Silicon Dioxide (SiO2) with inclusions of Hematite or Goethite
mineral
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Green Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Orange Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
mineral
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Smoky Quartz with Siderite
Silicon Dioxide (SiO2) with Iron(II) Carbonate (FeCO3)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Gold Nugget
Native Gold (Au)
mineral