Mineral Art with a Quartz Theme.

Quartz (Amethyst), Jackson's Crossroads, Georgia, 2009; painted 1:1 at 18.5 cm across, watercolor, colored pencil on cardboard by Hildegard Königshofer. Art was born out of a desire or need for documentation or the presentation of knowledge in visual form. Quartz (Smoky Quartz), Microcline (Amazonite), Pikes Peak, Colorado, 2009; painted 1:1 at 13.7 cm across, watercolor and colored pencil on watercolor paper by Hildegard Königshofer. [Extracted from the article]