Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Category
Not A Rock (Biological
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Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Ironstone Nodules (Iron Concretion)
Siderite or Hematite Concretion
sedimentary
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Lava Rock Substrate
Scoria (Basaltic Rock)
igneous
Chert or Flint
Silicon dioxide (SiO2)
sedimentary
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Undetermined Due to Blur (Possible Flesh-Tone Mineral)
Unknown (Insufficient Visual Clarity)
Mineral
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Sandstone with Lichen and Iron Oxide Staining
Quartz Arenite / Sandstone
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Not a geological specimen
N/A (man-made object)
N/A
Seashell Fossil
Mollusca (Bivalvia)
fossil
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Limestone with Lichen
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Seashell (Cockle Shell)
Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite
fossil
Hag Stone (Odin Stone / Adder Stone)
Perforated Pebble (commonly Chert, Mudstone, or Limestone)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite
fossil
Tumbled jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides and hydroxides
mineral
Moss-covered Limestone with Quartz/Calcite Pocket
Calcium Carbonate (CaCO3) rock with biological moss coating
sedimentary
River Cobble with Algae Patina
Weathered Chert or Quartzite pebble (SiO2 dominated)
sedimentary