Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Man Made Rock (Sedimentary Analogue)
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Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
sedimentary
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (with Quartz)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Coquina
Bioclastic Limestone
sedimentary