466 RECOKD OF SCIENCE FOR 1887 AND 1888. 



schrift, 1888, vol. xv, 103. lu the latter place biortdablite is lueu- 

 tioued as another new mineral from the same region but not described. 

 BarysiL — A new lead silicate from the Harstig mine, Pajsberg, Swe- 

 den. It is referred to the hexagonal system, has basal cleavage, white 

 color, hardness equal to 3, and a specific gravity of 0.11 to 6.55. An 

 analysis afforded : 



The formula is accordingly 3PbO. 2Si02. It occurs in iron ore with cal- 

 cite, yellow garnet, tepbroite, and galena. The name has reference to 

 its high specific gravity. (Described by A. Sjogren and Lundstrom in 

 the CEfversigt Vet. Akatl. Forhaudlingar, 1888, xlv, 7.) 



Belonesite. — The study of a mass of ancient volcanic rock enveloped 

 in the Vesuvian lava of 1872 has led to the discovery of two species to 

 ■which Scacchi has given the names belonesite (belonesia) and cri- 

 phiolite (crifiolite). Belonesite, as the name suggests, occurs in needle- 

 like crystals. These are white and transparent, and are referred to the 

 tetragonal system. The material was iusufiticient for an analysis, but 

 qualitative tests led to the conclusion that it is a molybdate of magne- 

 sium. 



Cnphiolite occurs in small tabular crj'stals belonging to the mono- 

 clinic system. They are covered by apatite so as to be concealed by 

 it, whence the name given to the species. The color is honey-yellow ; 

 the specific gravity 2.674. An analysis gave: P2O5 48.01, MgO 33.58, 

 CaO 14.60. Loss 2.91==100. The examination showed that fluorine 

 was probably present, and the amount is estimated as nearly equal to 

 7 per cent. The mineral is hence near wagnerite in composition. 

 (Described by A. Scacchi in Mem, Accad. Napoli, 1887, vol. i, No. 5.) 



Bementitc. — A new manganese silicate from the prolific locality at 

 Franklin Furnace, New Jersey. It occurs in stellate aggregations, 

 having a foliated structure and in aspect closely resembling some pyro- 

 phyllitc. The color is a pale grayish-yellow; it is soft and friable; the 

 specific gravity is 2.981. An analysis yielded : 



SiO. MuO FcO ZuO MgO H2O 



39.00 42.12 [3.75] 2.86 3.f^3 8.44 = 100 



This yields the formula 2(H2,Mn)0,Si02. Itisfouud that thewatergoes 

 off at a temperature above 200°. ]5ementite is named after Mr. Clarence 

 S. Bement, of Philadelphia, by G. A. Koenig. (Proceedings Acad. Nat. 

 Sci., Philadelphia, 1887, )). 311.) 



BeryJlonite. — A new beryllium phosphate from Stoneham, Maine. A 

 preliminary description announces that it occurs in colorless crystals 

 and cleavage fragments. The crystals are highly modified, and belong 

 to tlie orthorhombic system, with a prismatic angle of about 120°. The 

 hardness is 5.5 ; the specific gravity 2. A qualitative analysis by H, L. 

 Wells shows it to be an anhydrous phosphate of beryllium and sodium. 



