Anorthosite attracted its early discoverers with its beauty. The remarkable iridescence of the feldspar along parts of coastal Labrador was described by Steinhauer (1814): “…its colours darting through the limpid crystal of the lake, and flashing from the cliffs more especially when moistened by a shower of rain, changing continually with every alteration in the position of the boat, are described as almost realizing a scene in fairy land.” Anorthosite was referred to for many years as Labrador stone, and intermediate plagioclases of all compositions were called labradorite. Further details about the early history and discovery of anorthosite can be found in de Waard (1968a).
KeywordsMercury Silicate Recrystallization Magnetite Olivine
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