The answer is “Meerschuim pijp” (meerschaum pipe).
Meerschaum pipes are known for being made from a lightweight, white mineral called sepiolite. They are often carved into intricate designs, making them not just a smoking tool but also a work of art.
The number of letters in “Meerschuim pijp” is 15, so the answer doesn’t fit the clue (7 letters). This could be a trick question, or it could be referring to a specific type of meerschaum pipe with a shorter name that has 7 letters.