The geology of the Dun Mountain subdivision, Nelson . 89 It 10 per cent, of the rock consisted of undecomposed grossularite, the followingmolecular proportions remain: — Silica (Si02) ..Alumina (A1203)Lime (CaO)Water (H20) . 576182374189 This is almost exactly the molecular composition of prehnite, which is 2CaO H20 A1203 3Si02 It is considered that this analytical and optical result, coupled with the closechemical relationship between grossularite and prehnite—a replacement of a moleculeof lime by one of water—justifies the conclusion that the mineral resulting from thedecomposition of grossu
The geology of the Dun Mountain subdivision, Nelson . 89 It 10 per cent, of the rock consisted of undecomposed grossularite, the followingmolecular proportions remain: — Silica (Si02) ..Alumina (A1203)Lime (CaO)Water (H20) . 576182374189 This is almost exactly the molecular composition of prehnite, which is 2CaO H20 A1203 3Si02 It is considered that this analytical and optical result, coupled with the closechemical relationship between grossularite and prehnite—a replacement of a moleculeof lime by one of water—justifies the conclusion that the mineral resulting from thedecomposition of grossularite is prehnite; and it is a result that does not appear tohave been obtained in any previous investigations. In the whole mass of the intrusive rocks which lie to the east of the peridotites,and which the writers have classified as rodingites, prehnite takes the place of grossu-larite. Only one specimen taken from this mass contained unchanged was obtained in the Hacket Creek, half a mile above the Mineral Belt. PLATE V.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1911
