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CHAPTER V.
ANDALUSITE.
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HIS
mineral, which was named from its occurÂrence in the province of
Andalusia, in Spain, is occasionally found in Brazil in clear crystals
admitting of being cut as an ornamental stone, Andalusite is, however,
a very rare gem-stone. It is remarkable for displaying marked
pleochroism. Some of the green crystals shew in the dichroiscope green
and yellow images, whilst the brown crystals give a reddish brown and
greenish yellow. A remarkably fine specimen of rich colour and great
brilliancy, weighing 17-1/2 carats, was recently in the author's
possession. Although a beautiful stone its hardness is only slightly
above that of quartz.
ANDALUSITE.
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