Chert (Field Pebble)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
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Chert (often called Jasper or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Microcrystalline Quartz)
Chert / SiO2 (Silicon Dioxide)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Pyrite (FeS₂)
Mineral
Greenstone or Chlorite Schist
Greenschist / Chlorite schist
metamorphic
Leopard Skin Jasper
Chalcedony (cryptocrystalline Quartz)
Mineral
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3) Matrix with Fossil Fragments
fossil
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Chert (Flint variety)
Microcrystalline Silica (SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Serpentinite
Serpentinite (Mg ₃ Si ₂ O ₅ (OH) ₄)
metamorphic
Carnelian
Chalcedony (SiO2) with Iron Oxide inclusions
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Graphite
Graphite (Native Carbon, C)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) vein cutting through host rock
mineral
Native Gold in Quartz
Native Gold (Au)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentine
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Gabbro
Gabbro (mafic intrusive igneous rock)
igneous
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite Nodular Concretion
Iron(III) oxide (Fe2O3)
mineral
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
sedimentary
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic