22102 - Beautiful 2.48 Inch Pyrite Crystals from famous Navajun Mines (Spain) Squalicorax very likely of the Dromaeosauridae

very likely of the Dromaeosauridae family

which is in a Cenomanian fluvial sandstone in the Kem Kem Formation of Morocco

A recent phylogenetic assessment of Tomistoninae determined that M

several of which are semi-precious gemstones

Micraster glyphus

22102 - Beautiful 2.48 Inch Pyrite Crystals from famous Navajun Mines (Spain) Squalicorax very likely of the DromaeosauridaeThe mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron(II) disulfide). Pyrite is considered the most common of the sulfide minerals. Pyrite's metallic luster and pale brass yellow hue give it a superficial resemblance to gold, hence the well known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.