Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone
sedimentary
Pink Granite
Phaneritic plutonic igneous rock (Alkali-feldspar granite)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Basalt Pebble
Basalt (Extrusive Mafic Igneous)
igneous
Limonite/Hematite Ironstone
Goethite-rich Ironstone (FeO(OH) · nH2O)
sedimentary
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Yellow Ocher / Limonite
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Tiger's Eye
SiO2 (Quartz with inclusion of iron oxides)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Lava Stone and Chakra Beads
Basalt (with various mineral/synthetic beads)
igneous
Agate
Silicon Dioxide (SiO2)
mineral
Specular Hematite (Polished Sphere)
Hematite (Alpha Fe2O3)
mineral
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Slag
Anthropogenic Iron Silicate Glass
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)
mineral
Yellow Jasper
Tectosilicates (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Yellow Aventurine
Quartz (SiO2) with iron-bearing inclusions
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Trilobite Fossil
Trilobita (Class), likely Phacopid or Asaphid order
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Basalt (River Pebble)
Extrusive Magic Igneous Rock (Mainly Plagioclase and Pyroxene)
igneous
Fuchsite on Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities
metamorphic
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
sedimentary
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Dalmation Stone (Dyed)
Peralkaline rhyolite
igneous
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Dalmatian Stone (Dalmation Jasper)
Aplite with Arfvedsonite inclusions
igneous
Orthoceratid Fossil in Limestone
Orthoceras (extinct genus of Nautiloid Cephalopod)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral