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It's real name is Tiger Eye, but according to mindat.org it is a combination of chalcedony, a variety of quartz, and riebeckite, an amphibole mineral.
K. E. Beer has written:
'The concealed granite roof in south-west Cornwall'
'The petrography of some of the riebeckite-granites of Nigeria'
K. O Bennington has written:
'Thermodynamic data on the amphibole asbestos minerals amosite and crocidolite' -- subject(s): Asbestos, Thermodynamics, Riebeckite