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Zinc is a brittle bluish-white element that becomes coated with a corrision-resistant layer in moist air and occurs chiefly in sphalerite and smithsonite. That in itself is not particularly astringent. However, zinc oxide is a white insoluble powder used as a pigment in paints, cosmetics, glass and printing inks. It is an antiseptic and astringent and is used in making zinc ointment. (chemical formula ZnO). So it's zinc oxide that is astringent, rather than zinc itself.
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