Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Category
Sedimentary (Fossilized Organic Remain)
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Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Feldspar phenocrysts
igneous
Porphyritic Basalt
Porphyritic Mafic Volcanic Rock
igneous
Bull Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Porphyritic Basalt
Porphyritic Basalt (Mafic Igneous Rock)
igneous
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Ammolite
Biogenic gemstone (Aragonite, CaCO3)
mineral
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Quartzite
Quartzite (SiO2)
metamorphic
Anthracite Coal
Carbon (with organic impurities)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Fossil Coral
Hexagonaria or Rugose coral fossil in limestone/silica matrix
fossil
Crinoid Stem Fossil
Crinoid Columnal (Phylum Echinodermata)
fossil
Quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz
mineral
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Igneous Rock
igneous
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Porphyritic Basalt
Porphyritic Mafic Volcanic Rock
igneous
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Porphyritic Basalt (Leopard Palm Stone)
Porphyritic Mafic Volcanic Rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Fossil Shark Tooth
Carcharhinidae or Lamniformes sp. (possibly Carcharodon or Otodus genus)
fossil
Shark Tooth Fossil
Lamniformes (Shark tooth fossil composed of Fluorapatite)
fossil
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary