"Rock hounds" (like myself, in younger years) are searching the ground for any type of crystals, like crystals of quartz, that are found in many places on earth. For example in New York State they can occur as "Herkimer diamonds", or in the Alps, occasionally as brown or nearly black appearing "smoky quartz," also known as "morion," and so on.
Smoky quartz crystal (5 cm length) from the Austrian Alps, collected by and photo by the author.
