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Some of the minerals fluoresce a different color under UV B than they do when exposed to other wavelengths of UV. For example, some of the tugtupite from Greenland fluoresces three colors, from a pink, to a salmon, to an orange depending on the wavelength of the UV that is shining on the specimen. Some calcite from Challenger Cave, near Monterray, Mexico, fluoresces a bright blue-white under UV C, yellow under UV B (and 352 nm UV A), and hot pink under 368 nm UV A. All scheelite fluoresces a bright blue-white under UV C, but some scheelite specimens also fluoresce pink or yellow under UV B. In general calcites from Arizona are particularly nice under UV B and often a different hue than while under SW. The calcite and fluorite from the Hull mine in AZ fluoresce best under UV B. The material from my Purple Passion mine and my Hogan Claim (both in AZ) also exhibit a nice color change as the wavelengths change.  The calcite and fluorite actually look much better under both sw & LW.  Under UV C, the calcite fluoresces several shades of red and pink, the willemite fluoresces green or yellow-green, some of the fluorite fluoresces blue or purple, and the aragonite fluoresces a blue white or a cream. No matter what shade of red or pink the calcite fluoresced under SW it all changes to a scarlet color under UV B, additionally under the UV B, all of the fluorite fluoresces and some of the aragonite fluoresces. Under UV A only the fluorite and some of the aragonite or caliche fluoresces.

Most importantly if you are rock hounding you want the advantage of new finds.  Not everyone uses all 3 wave lengths and the more color the better the price!