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Iridium Element-77 T-ShirtNamed for Iris, the rainbow goddess, iridium was named for the colorful salts it forms. Its signature uses include spark plugs, crucibles, electrical contacts, and the standard meter bar in historical metrology. It is also linked to the asteroid impact layer at the dinosaur boundary, a major scientific clue in the study of mass extinction and impact geology. Product notes: Made to order graphic T shirt with the design shown on this page. Check the

25 g/m²))

Named for Ytterby

the German state where it was discovered

Named from an ancient word for brimstone

Oxygen gets its proper square on the wearable periodic table

Named for the Titans of Greek mythology

The shirt lists the force carriers for those who need to read it on a tee

One-letter chemical symbols are a small periodic-table corner case worth putting in one place

and built for heat

Named for Lawrence Livermore National Laboratory

einsteinium was discovered in debris from a hydrogen-bomb test

Lead remains useful in controlled applications