Answer: meerschaum

AnswerCrossword Clue
MEERSCHAUMPipe material
MEERSCHAUMPipe bowl material
meerschaumtobacco pipe of meerschaum
meerschaum(German) hydrated magnesium silicate occurring as a soft white or yellowish claylike mineral, aka sepiolite
meerschauma fine light white clayey mineral that is a hydrous magnesium silicate found chiefly in Asia Minor and is used especially for tobacco pipes