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in the same manner. In these cases no crystallographic relation exists between the two minerals (enclosing and enclosed).
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In some rocks there seems to be little tendency for the minerals to envelop one another. This is true of many
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crystals ('chadacrysts') of other minerals. A poikilitic texture is most easily observed in
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where large later-formed less perfect crystals ('oikocrysts') surround smaller early-formed
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frequently enclose feldspar ophitically; less commonly iron oxides and sphene do so. In
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169:(ed.).
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