Wilfred Hudleston Hudleston

“ As the amount undecomposed is so small, the quantity of unaltered augite, diallage or enstatite, must be very trifling. Any olivine still existing would of course be dissolved; but the quantity of water found, and the fact that no gelatinous silica is noticeable, preclude the possibility of there remaining any considerable amount of this mineral [1] .
The quantity of ferric oxide is probably wholly in combination as normal magnetite; this would absorb 2⋅09 out of the 3⋅31 of ferrous oxide, leaving 1⋅22 ferrous oxide for the hydrous silicate which forms the bulk of the mass. ”

“ The undoubted presence of nickel is interesting in connexion with these magnesian rocks; it may exist partly as nickeliferous pyrrhotite, and partly as a base of the hydrous silicate. It has been calculated as an oxide. Sterry Hunt had previously detected it in the serpentines of Cornwall, Banffshire, and the Vosges, but states that none exists in the ophiolites of the Laurentian rocks of Canada [2] . ”

“ This is due to the presence, in all or nearly all of them, of a kind of alumina-lime felspar (?) , whose varieties may be grouped under the general term "Saussurite." The amount of alkali in those specimens examined appears to be so small that it has been queried in some cases when making up the total constituents.
One of the most interesting rocks is a peculiar gabbro occurring near Caerleon Cave [5] . This gabbro is remarkable for crystals of diallage of great size, associated with an opaque white mineral mass, representing the "Saussurite." ”