Common Building Material and Hazardous Silicate
Puzzle 18 of Astrology Medium Pack
Question is: Common Building Material and Hazardous Silicate
and the answer is: ASBESTOS
Word Meaning:
ASBESTOS — (mineralogy) Any of several fibrous mineral forms of magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, chemical filters, suits, fireman's gloves, etc.
Definitions from Wiktionary.