Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Granitic Pegmatite
Pegmatite
igneous
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Slate
Slate (Foliated metamorphic rock)
metamorphic
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Jasper with Red Inclusion
Silicon Dioxide (SiO2) with Iron Oxides
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite with iron oxide (Hematite) cement
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Siltstone with plant fossil impression
Sedimentary rock with Archaeopteris or Calamites flora impression
fossil
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Yellow Chert
Microcrystalline Quartz (SiO2)
sedimentary
Schist
Crystalline Schist (often containing Muscovite, Biotte, or Quartz)
metamorphic
Likely iron-rich rock or metallic mineral fragment
Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment
mineral
Orbicular jasper / brecciated jasper
Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments
metamorphic
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Quartzite Pebbles with Quartz Veining
SiO2 (Silicon Dioxide with country rock matrix)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary