Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Category
Organic Material (Likely A Fruit Or Berry)
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Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Chert / Fossiliferous Limestone
Sedimentary Chert (often containing CaCO3 or SiO2 replacements)
sedimentary
Plume Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Palm Wood Fossil
Palmoxylon
fossil
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Fossilized Rugose Coral in Limestone
Order Rugosa in Sedimentary Matrix (CaCO3)
fossil
Garden Quartz
Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)
mineral
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Moss Agate
SiO2
mineral
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Dendritic Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Amber
Succinite (C10H16O)
gemstone
Red Coral (Sponge Coral / Apple Coral)
Corallium rubrum (calcium carbonate / organic gem)
gemstone
Chert (with Limestone matrix)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Amber
Succinates (Fossilized Resin)
mineral
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Amber
Succinite (Organic Gemstone)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Amber
Succinate (Fossilized Tree Resin)
gemstone
Fossiliferous Limestone Pebble
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinate (Succinite for Baltic varieties)
mineraloid
Amber
Succinite (Resin C10H16O)
mineral