Geology and Mineralogy. 15 



This is not very far from common orthoclase feldspar, and also 

 approximates to the composition of leucite. The anthor suggests 

 that it may be a case of feldspar pseudomorph after leucite, and 

 calls attention to its similarity to the pseudomorphs of potash 

 feldspar (and muscovite) after leucite from the Oberwiesenthal 

 in Saxony. The case is by no means proved, however, and it 

 is not improbable that the original mineral was the common 

 garnet of the locality already alluded to. 



The same author describes the Rumford tourmaline locality in 

 Oxford county, Maine, at which rubellite, indicolite and green 

 tourmaline have been obtained associated with fine scaly lepidolite, 

 amblygonite, cassiterite and albite. From Raymond, Maine, fine 

 specimens of essonite garnet have been obtained, some of tliem 

 showing a dozen alternate layers of garnet and calcite ; the break- 

 ing off at a layer of calcite leaves a fine dodecahedral ci'ystal 

 within. A beryl from Auburn, Maine, is mentioned, which is 30 

 cm. high and 22 wide and has 50 different layers, 25 of beryl, the 

 others of albite, quartz and muscovite. The occurrence is noted 

 of fine blue beryls near Mt. Anteros, in the Arkansas Valley, 

 Chaffee County, Colorado, resembling those from Mourne Mt. in 

 Ireland. From Salicles, Colorado, large quantities of dodecahe- 

 dral garnets have been obtained, which are coated with chlorite 

 somewhat similar to these from the Lake Superior region. 



The same author, in a recent paper before the New York 

 Academy of Sciences, gives a number of notes in regard to the 

 occurrence of minerals in the West. Some of them are as follows : 

 The occurrence of fine malachite in large masses at the Copper 

 Queen mine at Bisbee, Arizona, is mentioned ; also specimens 

 with crystals of calcite and malachite in large geodes, the latter 

 mineral in fine acicular crystals 2 to 4 mm. long, giving a rich 

 velvety surface; aurichalcite in beautiful tubes lining cavities 

 comes from the same locality. The fine crystals of azurite from 

 the Clifton mines, Graham County, Arizona, and also from the 

 Longfellow mine are mentioned, as also the occurrence of chryso- 

 colla at several localities, conspicuously at the old Globe mine in 

 Gila County. Cuprite and dioptase from the Clifton mines, and 

 cerussite for the Flux mine in Pima County and the Belle mine, 

 Yavapai County, are alluded to. 



15. A Mt. Blanc Fulgurite. — Mr. F. Rutley describes (Quar- 

 terly Journ. Geol. Soc, May, 1885) some specimens of hornblende 

 gneiss having a fused surface, from the summit of the Dom du 

 Goute, " a small peak rising out of the snow at a height of 

 14,000 feet above the sea-level," belonging to the Mt. Blanc 

 chain. The author speaks of the absence of crystallites in fulgu- 

 rites (consequent on sudden cooling), and of their being, hence, 

 the purest natural glasses ever formed. 



Mr. Rutley examined also a specimen of the bouteillenstein or 

 pseudo-chrysolite, of Moldauthein, in Bohemia, constituting nod- 

 ules in sand, and in his conclusion says : that its glass enclosures 

 and numerous gas-bubbles and its almost perfect freedom from 



