PETROLOGICAL ABSTRACTS AND REVIEWS 281 
SHAND, S. J. ‘On Saturated and Unsaturated Igneous Rocks,” 
Geol. Mag., X (1913), 508-14. 
Saturated, or sated, minerals are those which are capable of forming 
in the presence of free silica; unsaturated, or unsated, are those which 
do not appear in association with free silica. Among the former are 
orthoclase, albite, anorthite, pyroxenes, amphiboles, micas, tourmaline, 
spessartite, topaz, titanite, magnetite, ilmenite, apatite, zircon; among 
the latter, leucite, nephelite, sodalite, noselite, analcite, cancrinite, 
hauynite, melanite, melilite, olivine, pyrope, picotite, corundum, and 
perovskite. 
SKEATS, ERNEST W. ‘The Occurrence of Nepheline in Phonolite 
Dykes at'Omeo,” Australasian Assoc. Adv. Sci., XIII (1912), 
126-30, map I. 
Previously reported occurrences of feldspathoids in Victoria are 
shown to be undemonstrated or inaccurate. Here are described several 
phonolite dikes from near Omeo. The texture is trachytic, the minerals 
soda orthoclase, nephelite, and aegirite. 
SKEATS, Ernest W. ‘The Geology and Petrology of the Macedon 
District,’ Bull. Geol. Surv. Victoria, No. 24. Melbourne, 
© TOMAR 120. BS, oll sy, Toaeljo) 10, analyses. 
This paper gives a short geologic history of the Macedon District, 
40 miles northwest of Melbourne. ‘The principal part of the paper, how- 
ever, is devoted to the petrology of the region. The rocks described are 
dacites, granodiorites, granodiorite-porphyries, solvsbergites, trachytes, 
limburgites, anorthoclase-basalts, basalts, various metamorphic rocks, 
and two rocks described as macedonite and woodenite. Both are 
related to orthoclase-basalts and mugearites. The macedonite is dense 
and fine-grained with megascopically visible biotite flakes. The minerals 
shown microscopically are alkali feldspar, anorthoclase(?), acid plagio- 
clase, biorite, olivine, hornblende, augite, apatite, calcite, chlorite, 
serpentine, and chrome spinel. The woodenite is a dark, dense rock 
consisting of augite, magnetite, and olivine in a groundmass of dark 
glass. It agrees closely in chemical composition with absarokite. 
Twenty-nine analyses are given of the various rocks, and they are recom- 
puted in the C.I.P.W. system. The sequence of the alkali rocks in this 
district is discussed. 
