Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Category
Organic (Zoogenic)
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Amber
Succinates
mineraloid
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Amber
Amber (C10H16O)
mineral
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Likely fossil shell fragment
Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone
fossil
Amber
Fossilized Tree Resin
gemstone
Flint with Fossil Inclusion
Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains
sedimentary
Amber
Amber (Fossilized Tree Resin)
mineral
Moss Agate
SiO2
mineral
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
gemstone
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Amber
Succinite (C10H16O)
gemstone
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Amber
Succinate (Fossilized Tree Resin)
fossil
Amber (in Matrix/Shale)
Amber (Fossilized Tree Resin)
mineral
Chert Concretion / Nodule
Microcrystalline Quartz (SiO2)
sedimentary