Mindat.org is an online mineral and locality database. The site provides global location data for quite literally hundreds of minerals – e.g. Herbertsmithite. Scroll down for the map, which shows that Herbertsmithite may be found in : Chile, Greece, Iran, and the USA.
But the site is by no means restricted to exotic minerals – it also lists, for example, Ice. Its location-map shows that ice can be found in : Austria, Belgium, Canada, Germany, Mars, Norway, Outer Space, Russia, Slovakia, Spain, Tanzania, The Moon, and the USA. But, before prospecting, prospective ice hunters should perhaps take note of an important detail about one third of the way down the page – the Health Warning