a seismic wave released during an earthquake and/or its aftershock squeezes natural quartz crystals, leads to piezocatalytic reactions with gold-bearing solutions nearby, and some gold is deposite ...
Socialbuzzhive by Emily Standley Allard on MSN13 天
Abstract: The characteristics of the Y-cut quartz crystal plate are discussed. It is shown that by rotating a plate about the X axis special orientations are found for which the frequency spectrum is ...
This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine Minerals ...