Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Organic Gem Material (Botanical)
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Picture Jasper
SiO2
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Chert (Silicon Dioxide, SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Amber
Succinates (Organic compound: C10H16O)
mineraloid
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Red Jasper (River Polished Quartzite)
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities
sedimentary
Tumbled honey quartz (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂), with limonite/goethite inclusions or surface staining
mineral
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coal
Anthracite / Bituminous Coal
sedimentary
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Tufa (Calcareous Tufa)
Calcareous Tufa (Precipitated CaCO3)
sedimentary
Polished bloodstone (heliotrope)
Chalcedony (microcrystalline quartz, SiO₂) with red iron-oxide inclusions
mineral
Black Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Honey Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Laterite
Laterite (Iron and aluminum-rich residual rock)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite / Fossilized Resin (C10H16O)
fossil
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Dearest Ring (Gemstones)
Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Slate
Slate (Foliated metamorphic rock)
metamorphic
Quartz vein in host rock
Quartz (SiO₂), likely in a weathered carbonate or sedimentary matrix
mineral
Weathered limestone or calcareous fossil fragment
Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone
sedimentary
Siltstone with plant fossil impression
Sedimentary rock with Archaeopteris or Calamites flora impression
fossil
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
sedimentary
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
metamorphic
Amethyst
Quartz, purple variety — silicon dioxide (SiO₂)
gemstone
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Ruby in Matrix
Corundum (Al2O3)
mineral
Fossilized Shark Tooth
Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))
fossil
Diamond
Diamond (C)
gemstone
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)