Libyan Desert Glass
Impactite (High-silica tektite)
mineral
Category
Synthetic Or Natural Fiber
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Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Moqui Marble
Ironstone Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
White Moonstone (Scolicite or White Feldspar var. )
Lattice-structure Silicate (KAlSi3O8)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Green Banded Agate
Agate (Variety of Chalcedony/Quartz), SiO2
mineral
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Fossiliferous Limestone (Chert/Clay mixed)
Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Black Onyx
Silicon Dioxide (SiO2)
mineral
River Pebble (Likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Diamond (or Diamond Simulant/Cubic Zirconia)
Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Granite
Granite (primarily Quartz, Feldspar, and Mica)
igneous
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Decomposed Granite
Grano-diorite/Granite-residuum (SiO2 primary)
igneous
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Byproduct)
mineraloid
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral