The volcano was almost continously active from its birth in 1770 until 1958. Since then only a brief, very small flank eruption in 1966 has interrupted dormancy. Pre-1966 Izalco lavas are vesicular vitrophyric olivine basalts, usually with bytownite phenocrysts and augite.
Many new minerals have been found in the fumaroles and fumarolic sublimates which are unusually rich in vanadine.
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Map Reference: 13°48'N , 89°36'W
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Mineral List:19 entries listed. 14 valid minerals. 8 type localities (valid minerals).
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
