Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Category
Sedimentary (Primary) With Artificial Modification
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Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Granite (Background) and Quartzite/River Pebble (Foreground Heart)
Phaneritic Felsic Igneous Rock (Granite background)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Larimar
Pectolite (NaCa2Si3O8(OH))
Mineral variant / Gemstone
Quartz Vein Rock
Silicon Dioxide (SiO2)
Mineral
Specular Hematite
Hematite (Iron Oxide, Fe2O3)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Basalt
Basalt
igneous
Magnetite with Pyrite or Chalcopyrite inclusions
Magnetite (Fe3O4) with Pyrite (FeS2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Diamond
Diamond (Pure Carbon, C)
Mineral
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Rough Aquamarine
Beryl (Be₃Al₂Si₆O‑₁•H₂O)
Mineral
Druzy Agate (specifically Black Druzy Agate)
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Quartz (in matrix)
Quartz (SiO₂)
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Botryoidal Hematite
Iron Oxide (Fe2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Peridotite
Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)
igneous
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
Mineral
River Stone (Quartzite)
Quartzite (SiO2)
metamorphic
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Ferruginous Quartzite (also known as Ironstone or Gossan)
Ferruginous Quartzite with Goethite/Hematite staining
metamorphic