Availability Assigned color code GS6 and touch-up paint code WA-634D, Smokey Quartz Metallic replaces Mineral Metallic on the 2019 GMC Terrain (which was deleted mid-2018 model year).

Here’s a first look at the new Smokey Quartz hue. Assigned color code GS6 and touch-up paint code WA-634D, Smokey Quartz Metallic is one of five darker hues available for the 2019 GMC Acadia.

The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the crystalline quartz. Quartz occurs in many ...

In the slightly polished crystals, the smoky layers were observed just below the surface. In this area, the color of both amethyst and citrine is rather pale. The two (broken) fragments that did not ...

Impure quartz can take on a rainbow of colors, and goes by many names. Amethyst is just purple quartz. Citrine is orange or yellow. Rose quartz, milky quartz, and smoky quartz are self-explanatory.

A natural smoky quartz with an obvious mineral inclusion at the center of the stone (figure 1) was recently observed by the author. Raman analysis confirmed that this mineral was apatite. The apatite ...