Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Category
Man Made Object (Ring)
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Jasper (Yellow/Brown variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Calcite (often sold as Onyx Marble)
Calcium Carbonate (CaCO3)
mineral
Red Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Lapis Lazuli
Complex silicate rock containing lazurite, calcite, and pyrite
gemstone
Super Seven (Melody Stone)
Quartz with inclusions (Amethyst, Cacoxenite, Goethite, Lepidocrosite, Rutile, Smoky Quartz, and Clear Quartz)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Tumbled Gabbro
Gabbro (Mafic intrusive igneous rock)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (River Siltstone/Quartzite type)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Faceted pale-green gemstone, likely prasiolite or green quartz
Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph
gemstone
Moonstone
Orthoclase / Feldspar (KAlSi3O8)
gemstone
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Green Tourmaline (Verdelite)
Complex sodium iron aluminum borosilicate (Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4)
gemstone
Pearl
Calcium carbonate (Aragonite/Calcite) - CaCO3
gemstone
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Heliotrope (Bloodstone)
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Pearl (Cultured Freshwater)
Calcium Carbonate (Aragonite) - CaCO3
mineral