Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Category
Organic Mineraloid And Mineral
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Fossilized bone, likely a large vertebrate limb or rib fragment
Petrified bone; exact taxon indeterminate from the image
fossil
Polished chalcedony (likely moss/ag ate)
Microcrystalline quartz, SiO₂; probable moss agate or jasper variety
mineral
Tumbled agate (likely moss or plume agate)
Microcrystalline quartz, primarily chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Fossil tooth fragment
Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image
fossil
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Amber beads
Amber, fossilized plant resin; largely polymerized terpenoid resin (not a mineral)
gemstone
Fossil plant impression slab
Fossilized plant compression/impression; exact taxon indeterminate from the image
fossil
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Amber
Fossilized Tree Resin (Organic Polymer)
gemstone
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Enrolled Trilobite Fossil
Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)
fossil
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (Zebra Calcite)
Calcite (CaCO3) with trace organic or oxide inclusions
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Fossilized Bone
Petrified Bone (Fluorapatite / Calcium Phosphate replacement)
fossil
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Petrified Wood
Silicified Wood (Permineralized wood)
fossil
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Purple amethyst crystal specimen
Amethyst, purple variety of quartz (SiO₂)
mineral
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral