Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Blue quartz crystal (likely synthetic or coated quartz)
Quartz, silicon dioxide (SiO₂); possible aqua-aura quartz
mineral
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Strawberry Quartz (or Rose Quartz / Cherry Quartz)
Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions
mineral
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Lapis Lazuli
Lazurite-dominated metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Faceted clear gemstone, likely quartz (rock crystal)
Quartz, silicon dioxide (SiO₂); exact identity is uncertain because the strong flash and cut obscure diagnostic features
gemstone
Amethyst (likely synthetic or treated)
Purple quartz, SiO₂; color caused mainly by trace iron and irradiation
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pumice or vesicular volcanic tuff
Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments
igneous
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint)
Chert (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Ametrine
SiO2 (Silicon Dioxide with iron impurities)
gemstone
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Blue Sapphire
Corundum (Al2O3)
gemstone
Chert
Chert (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (with iron oxide cement)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Blue sapphire (likely synthetic or treated corundum)
Corundum, aluminum oxide (Al₂O₃), blue from iron and titanium impurities
gemstone