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This is a reflected light micrograph of polished, carbon coated pollucite crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. Pollucite is the only mineral
which contains significant amounts of the rare element cesium. It even has a small amount of rubidium, which is not found as a principal component in any mineral. The Bernic Lake pegmatite is
one of the world's major producers of rare elements like cesium (Cs), niobium (Nb) and tantalum (Ta).
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