Phillips — Analysis of Pele's Hair and a Stalagmite. 473 



the auriferous slate series at the headwaters of Poorman creek, 

 in a decomposed portion of which free gold occurs associated 

 with little veins of quartz. As the gulch was very rich below 

 this dike, it is possible that much of it came from the rhyolite. 

 The occurrence is remarkable inasmuch as the rhyolite is prob- 

 ably of Tertiary age. This rhyolite is a white rock with 

 abundant foils of a brown mica, and phenocrysts of sanadine 

 and plagioclase with a few rounded quartzes in a microcrystal- 

 line groundmass. 



Gold with cinnabar. — Besides the Blue Wing vein locality 

 previously noted, gold occurs with cinnabar in a vein in diabase 

 near Coulterville. The cinnabar is in large fine crystals. The 

 mine is the property of C. L. Mast and is the one referred to 

 by Becker.* 



Free gold is found with cinnabar in the Manzanita mine in 

 Colusa county in the Coast ranges in metamorphosed strata 

 containing Aucella jpiochi G-abb ; a fossil characteristic of the 

 lowest Cretaceous. 



Aet. LX. — A recent analysis of PeWs Hair and a Stalag- 

 mite from the lava Caves of Kilauea ; by A. H. Phillips. 



The Pele's Hair was collected the past summer by Prof. 

 Libbey during his recent trip to Hawaii. In both cases the 

 finely powdered substance was dried at 100° C. On subse- 

 quently igniting the stalagmite became reddish and increased 

 in weight due in all probability to the oxidation of the ferrous 

 iron present. 



Si0 2 A1 2 3 Fe 2 3 FeO MnO P 2 5 CaO MgO Ma 2 K 2 Total. 

 Peles' Hair. 50-76 14-75 2-89 9 85 -41 "26 1L05 6-54 2-70 -88 100-09 

 Stalagmite,' 5L77 15-66 8-46 6-54 -82 .. 9-56 4-95 2-17 -96 100-89 



The above analysis of Pele's Hair does not differ in any 

 essential respect from that of Prof. O. D. Allen's, f but there is 

 quite a large difference, both in the amount of alumina and 

 potassa when compared to that of D. E. Cohens. ;£ In the lat- 

 ter the alumina is only 9'14 per cent while the potassa is 3*06 

 per cent. These variations may be explained by the fact 

 that, the fused lava charge of Kilauea is drawn off every few 

 years by some subterranean channel and is again slowly refilled 

 by a new supply. 



The stalagmite is of the kind, so characteristic of the lava 

 caverns of Kilauea and Mount Loa ; while it has not been pos- 



* Quicksilver Deposits, p. 383. f This Journal, 1879, III, xviii, p. 134. 



% Quoted in Characteristics of Yolcanoes, Dana, p. 348. 



