This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
A concrete resinous exudation from Pistacia Lentiscus Linne (nat. ord. Anacardieae).
Globular or elongated tears, of about the size of a pea, sometimes covered with a whitish dust, pale yellow, transparent, having a glass-like lustre and an opalescent refraction; brittle; becoming plastic when chewed; of a weak, somewhat balsamic, resinous odor, and a mild terebin-thinate taste.
Impurity. - Sandarac.
Pilulae Aloes et Mastiches. - See Aloes, p. 498.
Mastic is a mild stimulant, mostly used as a masticatory, for filling decayed teeth, and for cements and varnishes.