Rounded gray pebble, likely quartzite
Quartzite (predominantly crystalline quartz, SiO₂); identification is tentative from the image
metamorphic
Category
Synthetic Glass (Man Made)
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Sandstone
Clastic Sedimentary Rock
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Chert
Chert (SiO2)
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
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
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (with iron oxide cement)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Emerald-and-diamond ring
Emerald: beryl, Be₃Al₂(SiO₃)₆, colored by chromium and/or vanadium; surrounding stones appear to be diamonds: carbon
gemstone
Lapis Lazuli
Lazurite-dominated metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Chert
Silicon dioxide (SiO2)
Sedimentary
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Blue Sapphire
Corundum (Al2O3)
gemstone
Carved Stone Turtle
Carved Soapstone and Quartz
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with trace aluminum and irradiation
mineral
Ametrine
SiO2 (Silicon Dioxide with iron impurities)
gemstone
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Colorless faceted gemstone, likely glass or cubic zirconia
Uncertain; possible cubic zirconia (zirconium dioxide, ZrO₂) or synthetic glass
gemstone
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Likely flint (dark chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Tumbled brown chalcedony or agate
Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Blue sapphire (likely synthetic or treated corundum)
Corundum, aluminum oxide (Al₂O₃), blue from iron and titanium impurities
gemstone
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral