Organic (Paper And Cellulose)

Diamond

C (Carbon)

Gold Nugget

Native Gold (Au)

Petrified Wood

Silicified Wood (primarily SiO2)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Iron Meteorite (likely Chondrite or weathered Iron-Nickel)

Meteorite (Fe-Ni alloy & silicates)

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Kimberlite with Diamond

Kimberlite (Diamond formula: C)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Black Pearl (Tahitian Style)

Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin

Coprolite

Fossilized feces (various taxa)

Opal

Hydrated amorphous silica (SiO2·nH2O)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Gastropod Internal Mold (Steinkern)

Class Gastropoda fossil mold (Phylum Mollusca)

Spinosaurus Tooth

Spinosaurus aegyptiacus (fossilized in Hydroxyapatite)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Native Gold (in Jewelry)

Gold (Au)

Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)

Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)

Gold Nugget

Native Gold (Au)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Basalt with Secondary Mineral Inclusions

Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt Pebble with Epidote/Olivine

Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)

Basalt River Stone

Aphanitic Mafic Igneous Rock

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Vesicular Basalt with Secondary Mineral Inclusions

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt

Basalt (Mafic volcanic rock)

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)

Basalt River Stone

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Crushed Roadstone)

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Porphyritic Basalt with Quartz Inclusions

Aphanitic Porphyritic Basalt

Basalt

Basalt (Mafic volcanic rock)

Vesicular Basalt

Basalt (Extrusive Igneous Rock)

Basalt River Pebble

Basalt (fine-grained mafic igneous rock)

Basalt (Beach Pebble)

Extrusive mafic igneous rock

Basalt (River Rock Cobble)

Extrusive mafic volcanic rock (Basalt)

Granodiorite

Phaneritic Plutonic Rock - Granodiorite