Heating Experiments on Amazonite

Ivar Oftedal
Min. Inst., University of Oslo

Summary: The rate of decolorization of a Norwegian amazonite was studied at various temperatures: near 500° C. it was almost instantaneous, becoming successively slower with lower temperatures, until at 300° C. no change was visible in 10 hours. It is concluded that the colour is stable indefinitely below about 270° C. and that this is the maximum temperature at which the colour could have appeared.

Mineralogical Magazine; March 1957 v. 31; no. 236; p. 417-419; DOI: 10.1180/minmag.1957.031.236.10
© 1957, The Mineralogical Society
Mineralogical Society (www.minersoc.org)