1(a). Select ten different minerals, and name a product for each

Warning. CHOOSE THESE TEN WITH REQUIREMENT 1(c) IN MIND, BECAUSE YOU ONLY CHOOSE ONCE. Part (c) opens "From the list of minerals you chose for requirement 1(a)" and asks which countries those minerals can be found in. Ten minerals whose production is published country by country, such as copper, iron, aluminium ore, gold, silver, lithium, tungsten, silica, phosphate and salt, make part (c) an evening of reading, because national geological surveys publish exactly those figures. Ten unusual ones chosen because they are interesting make it a research problem with no obvious source, and by then the list is set.