Fig. 4. —Group 4. Picture length = 2mm. Specimen 7, crossed nicols, showing very fine spherulitic chalcedonic groundmass with local patches of coarser spherulitic development (left), and abundant lozenge-shaped calcite (white to grey). At right of picture can be seen the darker amorphous pseudomorphs after calcite produced in the weathered skin.
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Transactions of the Royal Society of New Zealand : General, Volume 2, Issue 4, 2 November 1967, Plate 3
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50Fig. 4.—Group 4. Picture length = 2mm. Specimen 7, crossed nicols, showing very fine spherulitic chalcedonic groundmass with local patches of coarser spherulitic development (left), and abundant lozenge-shaped calcite (white to grey). At right of picture can be seen the darker amorphous pseudomorphs after calcite produced in the weathered skin. Transactions of the Royal Society of New Zealand : General, Volume 2, Issue 4, 2 November 1967, Plate 3
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