Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Category
Man Made Object (Ring)
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Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone (with banding)
Arenite (primarily SiO2)
sedimentary
Quartz-veined Metamorphic Rock (Wishing Stone)
Quartz-veined Metamorphic/Igneous Host Rock with Quartz Veinlets
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartzite
Silica (SiO2) quartzite
metamorphic
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid Stem Segment Fossil
Crinoidea (columnal ossicle)
fossil
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Malachite
Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2
Mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Nephrite Jade
Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Carnelian (Tumbled)
Carnelian (variety of Chalcedony, SiO2)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (Natural silica glass)
meteorite
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Carnelian
Quartz (Silicon Dioxide, SiO2)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Rose quartz (polished fragment)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
man-made glass mineral simulant
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)