Sandstone (Quartzose)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Not A Natural Rock
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Vesicular Basalt or Hag Stone
Basalt (with vesicles) or bored Sedimentary Rock
igneous
Pink Granite Boulder
Granite (Felsic Intrusive Igneous Rock)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Chert
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble
Quartzite / Lithic Sandstone
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Slate
Slate (Low-grade foliated metamorphic rock)
metamorphic
Iron-rich laterite or limonite/goethite-bearing rock
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O), likely in a lateritic matrix
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
River Cobble (Quartzite or Gneiss)
Metamorphic crystalline rock (predominantly SiO2 based)
metamorphic
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Dalmatian Stone (Dalmation Jasper)
Aplite with Arfvedsonite inclusions
igneous
Blue Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Granite
Felsic intrusive igneous rock (Granite)
igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Phaneritic plutonic rock (SiO2 > 69%)
igneous
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) with artificial dye
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Breccia
Breccia (Clastic sedimentary rock)
sedimentary
Chert (often called Jasper or River Rock)
Chert (SiO2)
sedimentary
Riverstone Jasper (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock)
igneous
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (SiO2 secondary)
sedimentary