Limestone with Fossil Imprints
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Category
Mineral Like Biological Tissue
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Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcite (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (fossilized tree resin)
mineraloid
Fossiliferous Limestone (Crinoidal)
Bioclastic Limestone (predominantly CaCO3)
sedimentary
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Fossiliferous Limestone
Limestone (CaCO3) with Crinoid/Bivalve fossils
sedimentary
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Pegmatite
Igneous Pegmatite
igneous
Yellow-brown chert or silicified rock
Microcrystalline quartz (SiO₂), possibly iron-stained chert
sedimentary
Carved red coral bead (likely coral or coral-colored resin)
Corallium spp. (precious coral; calcium carbonate, CaCO₃)
gemstone
Weathered chert or flint
Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from photo
sedimentary
Weathered limestone fragment
Limestone, predominantly calcite (CaCO₃), possibly porous bioclastic limestone
sedimentary
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Schist
Schist
metamorphic
Likely limestone or calcareous fossil fragment
Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Weathered sandstone
Quartz-rich clastic sandstone, chiefly SiO₂ with minor feldspar, lithic grains, and iron-oxide/clay cement
sedimentary
Likely flint/chert fragments
Microcrystalline quartz (SiO₂), possibly fossil-bearing chert
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Banded Gneiss
Gneiss
metamorphic
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Gneiss
Gneiss
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Pumice
Highly vesicular volcanic rock, commonly rhyolitic to dacitic glass (SiO₂-rich volcanic material)
igneous
Tumbled brown chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary
Chert (likely flint), possibly chalcedony-rich
Microcrystalline quartz, SiO₂ (quartz/chalcedony)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Fossiliferous limestone
Calcite-rich carbonate rock; chiefly CaCO₃ (often bioclastic limestone)
sedimentary
Fossiliferous conglomerate
Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)
sedimentary
Banded chert or flint pebble
Microcrystalline quartz (SiO₂), likely chert/flint with pale silica bands
sedimentary
Weathered limestone slab
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Gneiss
Gneiss
metamorphic
Gneissic Granite
Granite Gneiss
metamorphic
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Schist
Mica Schist (Metamorphic rock)
metamorphic