Quartz var. Amethyst on Danburite

Eight double terminated Amethyst Quartz crystals of delicate violet are strung out over a colourless Danburite crystal from Charcas in Mun. de Charcas, San Luis Potosí, Mexico.  The double terminated crystals form back-to-back pyramids as there is no prism body, with the largest Amethyst crystals measuring to about 5 mm on edge.  The translucent to gemmy Danburite, a calcium-boron silicate, measures 3 cm tall, is square in cross section and has vertically striated prism faces with a bright glassy lustre.  This splendid large thumbnail is mounted vertically on a square bevelled acrylic base.