Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Category
Synthetic (Man Made Material Mimicking Natural Stone)
Browse synthetic (man made material mimicking natural stone) specimens identified by the Rock Identifier community.
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Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond (Faceted)
Diamond (Pure Carbon, C)
gemstone
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Flint
Silicon dioxide (SiO2)
sedimentary
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
White Sapphire
Corundum (Al2O3)
mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary