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Suomen Geologinen Seura.. N: 0 35. Geologiska Sällskapet i Finland. 21 Fig. 3. Thin section of Tarhianpohja diabase where orthorhombic pyroxene occurs. ON THE TWIN LA WS OF PLAGIOCLASES The sections of this kind of altered, <strong>fi</strong>negrained rock do not offer much possibilites for accurate optical determinations. Yet some attempts were made. The plagioclases at the railway cutting showed consistently the same twin laws, or Albite, Carlsbad, Albite-Carlsbad, and in some cases Pericline lamellae. The anorthite content varied from 54 to 60 %. One km N of the railway cutting the groundmass plagioclases of the gabbro showed the same twin laws, Albite, Carlsbad and Albite-Carlsbad. The only exception observed was made by a large, clear grain, which here A Fig. 4. A plagioclase phenocryst with twin laws Albite, Ala A, and Albite-Ala A.
22 Bulletin de la Commission geologique de Finlallde N: 0 212. ! I \ \ ' QS °.0 . \ '\ ~ \ \ \ \ ". ~ \ ..... 1 \ \ c /- \. \ I I ' / / ..... I ..q \ I \. I 0\: 13 \ I A la .i:l-
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