a mass is a form of:

Indurate



ENGLISH MEANING
adjective
1.
Hardened; not soft; indurated.
2.
Without sensibility; unfeeling; obdurate.
verb
1.
(TRANSITIVE) To make hard; as, extreme heat indurates clay; some fossils are indurated by exposure to the air.
2.
(TRANSITIVE) To make unfeeling; to deprive of sensibility; to render obdurate.
3.
(INTRANSITIVE) To grow hard; to harden, or become hard; as, clay indurates by drying, and by heat.