Answer: tufa

AnswerCrossword Clue
TUFAPorous limestone
tufaavertine
tufaporous rock formed as a deposit from springs or streams
tufaporous limestone formed from calcium carbonate deposited by springs or the like
tufaa porous limestone, also TOPH, TOPHE
tufa(not in technical use) tuff2
tufatuff
TUFASoft, porous rock
TUFALime spring deposit
TUFALimestone deposite
TUFAGeyseral deposit
TUFAPorous rock
TUFAVolcano rock.
TUFAVolcanic rock.
TUFASoft, porous rock.
TUFAPorous rock.
TUFAPorous limestone.