SCIENTIFIC SUMMARY. 
325 
Siberia. (4^ The Konigin of Russia, and a fourth variety (d) from 
Rezbanya. Dr. Schrauf points out that the relation between the crystalline 
forms of Brochantite and those of Malachite. Just as Malachite was 
originally described as prismatic and subsequently determined to be 
monoclinic, so it appears that careful measurements of Brochantite tend to 
remove it from the prismatic system. The author believes that some 
varieties of Brochantite are monoclinic and others triclinic. In addition to 
the crystallographic details, the paper includes a comparative review of the 
paragenetic and chemical relations of the Brochantite group of minerals. 
A neiv Mineral: Kjeruljme . — Herr von Kobell has given this name to a 
new fluophosphate from Bamle in Norway. It is described as compact, 
with an imperfect cleavage in two directions nearly at a right angle. The 
fracture is uneven and splintery ; lustre oily ; colour faint red to yellow, in 
thin fragments translucent. G. = 3T5. H. = 4 — 5. When heated phos- 
phoresces with a white light. B.B. fuses easily at 3 with intumescence to a 
blebby enamel. Soluble in hydrochloric acid, but with greater readiness in 
nitric acid. With sulphuric acid, hydrofluoric acid is evolved and sulphate 
of lime separates from the solution. Analysis gave 
P Mg. Ca Na K FI Si Al Be S 
42-22 37-00 7-56 1-56 tr. 4-78 1-50 5-40 *r = 100*02 
Excluding the silica and alumina and the oxygen of the lime and soda, and 
averaging the analysis up to 100, von Kobell considers pure kjerulfine to 
consist of P 46*62, Mg 40*86, Ca 5*96, Na 1-28, FI 5-28, from which he 
calculates the formula to be 2Mg 3 P + Ca FI, in which a small portion of 
the calcium is replaced by sodium. 
The Recent Minerals of Vesuvius . — Of course in such a district as that of 
Vesuvius there must be new minerals appearing from time to time after 
eruptions have taken place. Professor J. Vom Rath, of Bonn, has published an 
important paper on this subject. The fourth part of this essay has just been 
published, and it consists of geographical, geological, and mineralogical obser- 
vations on the vicinity ofMassa Maritima ; on Calabria; and on Vesuvius. 
Under the last head, Vom Rath has many important observations on the 
minerals formed at the eruption of 1872. He shows that the composition of 
Microsommite of Scacchi is related to that of the sodalite group, and makes 
the important observation that nephelite, sodalite, and microsommite, which 
are alike in occurring in the pores of lavas, have resulted alike from the 
action of sea water (rich in chloride of sodium) on the silicate of the lava. 
Microsommite occurs in hexagonal prisms, with pyramidal planes on the 
basal edges, and has 43° 40' as the basal angle of the pyramid. Vom Rath 
concludes also that leucite was one of the results of sublimation at the 
eruption of 1872, as well as augite, hornblende, cavolinite, biotite, hematite, 
and magnetite. 
