Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Organic (Anthropogenic)
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Rounded brown sandstone or weathered river cobble
Likely quartz-rich sandstone; exact identification requires a fresh surface and tests
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Amber (Copal)
Succiniferous Resin
mineraloid
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber
Succinite (C10H16O)
mineral
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (C10H16O)
mineral
Shale
Fissile Mudstone (Shale)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Moss Agate
Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (Fossilized Tree Resin)
fossil
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Shell Cameo (Sardonyx Shell)
Cassis madagascariensis (Sardonyx shell)
mineral (biogenic silica/calcium carbonate substrate)
Amber
Succinite (C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil