IMAGES: Mineral Mother Lode

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Science  04 Feb 2005:
Vol. 307, Issue 5710, pp. 651
DOI: 10.1126/science.307.5710.651b

Glittering crystals of roselite owe their crimson hue to cobalt, which constitutes about 10% of their weight. Find out much more about roselite—from its chemical composition to the origin of its name—at Webmineral, an exhaustive database maintained by Houston, Texas-based geology consultant David Barthelmy. Since NetWatch's last visit (Science, 11 June 1999, p. 1731), this compendium of 4300 minerals has added photos for more than half the entries and Java applets that let you study each crystal's structure from multiple angles. You'll also find data such as the minerals' hardness rating, x-ray diffraction values, classification according to the Strunz and Dana systems, and other tidbits. For example, roselite isn't named for its ruddy color, but for Gustav Rose, a 19th century German mineralogist.

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