Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
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Man Made Object (Simulant)
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Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Granite
Granite (felsic intrusive igneous rock)
igneous
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Turquoise
Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Red jasper (likely iron-rich chert)
Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper
sedimentary
Polished brown jasper (likely ocean or brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
metamorphic
Tumbled gray stone, likely serpentinite or weathered basalt
Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph
igneous
Polished rose quartz
Rose quartz (quartz), SiO₂
mineral
Polished kambaba jasper
Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions
sedimentary
Red synthetic corundum (ruby-colored lab-grown sapphire)
Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored
gemstone
Fossilized ammonite (likely weathered ammonite cross-section)
Ammonoidea; commonly Jurassic–Cretaceous ammonite fossils replaced by calcite or aragonite
fossil
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Common Opal (Potch)
Hydrated Silica (SiO2·nH2O)
mineral
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Red Jasper
Argillaceous microcrystalline quartz (SiO2 with Fe2O3 inclusions)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Jasper (Banded Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Snowflake Obsidian (Tumbled)
Obsidian with Cristobalite inclusions
igneous
Smoky Quartz (with possible Feldspar inclusions)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
mineral
Orange Calcite (Polished Sphere)
Calcium Carbonate (CaCO3)
mineral
Diamond
Carbon (C)
gemstone
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Tumbled serpentine
Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Likely black beach pebble
Undetermined; possibly basalt, chert, or dark slate
sedimentary
Selenite (gypsum)
Gypsum, CaSO₄·2H₂O; variety: selenite
mineral
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil