Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Category
Organic Mineral
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Amber
Amber (Succinite), fossilized tree resin
Mineraloid
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Horse Chestnut (Buckeye seed)
Aesculus hippocastanum seed
Organic (Non-geological)
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold) in Matrix
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Turquoise, Pearl, and Coral Necklace
CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)
mineral
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Black Shale
Argillaceous Chert/Shale
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Fossil mammalian skull
Fossilized vertebrate bone; exact taxon cannot be determined from the image
fossil
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Black Marble (Veined Limestone/Marble)
Recrystallized Limestone / Metamorphic Calcite (CaCO3)
metamorphic
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
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
Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide, SiO2
Mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Calcite
Calcite (calcium carbonate, CaCO₃), likely massive or crystalline limestone-derived material
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil