This mineral's name derives from its type locality near a famous volcano, yet it is never found in igneous rocks. What is the mineral, how does it form, and why did it form in its type locality?

elburcher

VESUVIANITE Vesuvianite (also known as idocrase) is a mineral usually found in crystalline limestones occurring in tetragonal crystals, and also massive, of a brown to green colour, rarely sulphur yellow and blue, and is formed as a result of contact metamorphism. It is a silicate of alumina and lime with some iron magnesia and has the formulae Ca10(Mg,Fe) 2Al4(SiO4)5(SiO7)2(OH)4 and a relative hardness of 7. Vesuvianite was confirmed as a distinct species of mineral in 1795 and named vesuvianite after Mount Vesuvius in Italy where typical specimens are found. http://www.probertencyclopaedia.com/HL.HTM Apr 27 06, 9:39 PM

pu2-ke-qi-ri

Close. It's actually found in metamorphosed marls, so it isn't found in limestone. It formed at Mount Vesuvius when some marl came into contact with the hot lava. Apr 27 06, 10:38 PM

peasypod

Could it be vesbium/vesbine? http://www.minsocam.org/msa/collectors_corner/arc/vesuviusi.htm Apr 27 06, 11:18 PM

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