Visited the Ben E. Clement Mineral Museum in Marion, Kentucky the other day and found a friend among the quartz!
If a channelway for hydrothermal solutions is left incompletely filled with mineral matter, there may be cavities, or “vugs” in the deposit which will be lined with inward pointing crystals. These are quartz crystals, showing mainly the pyramid (or, more exactly, rhombehedron) faces. The quartz was deposited on a rounded surface of hydrothermal hematite (Fe2O3)… Continue reading Vein quartz
Specimen from Anselmo Mine, Butte, Montana Image by author