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It is a pseudomorph after iolite, and consists mainly of hydrous aluminium silicate.

Cassiterite occurs as a pseudomorph after orthoclase felspar in some of the altered granite of Cornwall, and it has occasionally been found as a cementing material in certain brecciated lodes.

The secondary mineral begins to form upon the surfaces and along the cracks of the olivine, gradually producing a mesh-work in the interstices of which small kernels of olivine remain; and when the process is completed the mesh structure persists in the resulting pseudomorph, giving a clear indication as to its history.

It is then called a pseudomorph, which is a term applied to any mineral which, instead of having the form it should possess, shows the form of something which has altered its structure completely, and then disappeared.

Hawksnest, over beyond, I noted, had its pseudomorph too; a newspaper proprietor of the type that hustles along with stolen ideas from one loud sink-or-swim enterprise to another, had bought the place outright; Redgrave was in the hands of brewers.