Fenster (window) quartz, Mexico

A specimen of fenster quartz from Paradon, Coahuila, Mexico.  Fenster refers to being window-like, which you can see with this piece having flatish surfaces.  It is discreetly glued on a white plastic base.

Just under 1 inch (2.5 cm) wide, 1/2 inch (1.3 cm) deep, 13/16 inch (2.0 cm) tall.