|Figure 8-9. Zone of secondary aragonite (S) between layers of primary aragonite (P). Note downward-pointing terminations (arrows) of aragonite needles in botryoids of secondary aragonite; needles of primary aragonite almost always point upward. Another image in this atlas shows another example of secondary aragonite.
Photomicrograph was taken in plane-polarized light; field of view is 2.1 mm wide. Drotsky's Cave, Botswana; Stalagmite BDS3; thin section B02; sample collected by Drs. George A. Brook and John Cooke.
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