Tumbled black-and-white stone, likely dalmatian jasper
Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions
igneous
Category
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Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Geode
Quartz / Chalcedony nodule
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone (Crinoid stem fragment)
Crinoidea (Phylum Echinodermata) in Calcite matrix
fossil
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
fossil
Fossiliferous Limestone (Crinoid stem)
CaCO3 (Calcium Carbonate) with Fossil Inclusions
sedimentary
Malachite-bearing Rock
Cu2CO3(OH)2
mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Crinoid Stalk in Limestone
Crinoid fossil in Biomicrite (Limestone)
sedimentary
Bivalve Fossil (Cockle shell)
Class Bivalvia (e.g., Anadara or Veneridae family)
fossil
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Brachiopod Fossil in Sedimentary Rock
Phylum Brachiopoda fossil imprint in sedimentary matrix
fossil
Hematite
Hematite (Fe2O3)
mineral
Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
sedimentary
Tumbled agate (likely chalcedony)
Microcrystalline quartz, SiO₂; agate is banded chalcedony, though banding is not clear in this specimen
mineral
Likely a small rough mineral specimen
Unidentifiable from the image; possibly a mica-bearing rock or green mineral
mineral
Polished brown agate pebble
Microcrystalline quartz (SiO₂), likely chalcedony/agate
mineral
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Mineral
Snowflake obsidian
Volcanic glass (mostly silica-rich obsidian) with cristobalite spherulites
igneous
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Amazonite
Microcline (KAlSi3O8)
mineral
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Yellow Sapphire (Pukhraj)
Corundum (Al2O3)
gemstone
Ironstone / iron-oxide-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone
sedimentary
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral
Agate
Chalcedony (Microcrystalline Quartz) - SiO2
Mineral
Fossilized Coral (Petrified Coral)
Anthozoa fossil
fossil
Agate
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral