New evidence on secondary twinning in albitic plagioclases |
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| Authors: | Silvio Capedri |
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| Institution: | (1) Istituto di Mineralogia e Petrografia, Modena, Italy |
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| Abstract: | Twinnings in albitic partially disordered plagioclases (An%=0–5; 2V variable between +80° and -87°) are described; they show optical-morphological features very similar to those exhibited by secondary twinning in calcic plagioclases. One of the twinning observed shows strong analogies with a phenomenon induced on a partially disordered albite in laboratory experiments (Borg and Heard, 1969). The data give new evidence on the debated existence of secondary twinning in albitic plagioclases. |
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