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Matrix of the Diamond

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16                 THE MATRIX OF THE DIAMOND
perfectly fresh olivine, and appears to be an incipient stage of serpentinisation.
The alteration into serpentine is shown in figures 8 and 9 ; and into the ehloritic mineral in figure 10.
The most interesting result of the serpentinisation of the olivine is the production of secondary rutile. Rutile never appears in the fresh olivine, but as serpentinisation begins rutile needles form along the border of the de­composing olivine, their longer axes being parallel to the outlines of the original crystal. When serpentinisa­tion has proceeded so far that only an inner kernel of olivine remains, rutile needles may be formed all around this inner kernel, lying in the serpentine pseudomorph, not irregularly as if ordinary enclosures, but in fixed crys-tallographical directions parallel to the olivine outlines. Figures 11 to 15 exhibit this secondary rutile.
The rutile needles have originated within from small particles of titanic iron enclosed in the olivine, or from
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