Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Category
Organic Mineral
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Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Petrified Wood
Silicified Wood (SiO2)
mineral
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Sandstone
Arenite
sedimentary
Amber
Succinates (fossilized tree resin), approximately C10H16O
organic gemstone
Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood Fragment
Silicified Wood (SiO2)
fossil
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Chert (Flint with Iron Staining)
Silicon Dioxide (SiO2)
sedimentary
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amber
Succinite (C10H16O)
mineral
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Amber
Succinite (C10H16O)
mineral
Moss Agate
Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)
mineral
Amber
Succinite (C10H16O)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary