MINERALOGY. 4G9 



The Ibrmulii is coii.sequeiitly H2O, Xa^.O, BeO, oSKK, or llSm BeSisOa. 

 It is associated with aiialcite, imtrolite, and apophyllite. (Brogger in 

 Nyt Mag. f. Vid., vol. xxxi, 196, 187; Nordeiiskiilld in Geol. Forening. 

 Forhaudl. 1887, vol. ix, 434.) 



FaccUite or FhuceUite. — Described by I''. Scacclii (Rend. Accad. Na- 

 poli, Decend)er, 1888) as a new mineral from Monte Somma; it is, bow- 

 ever, evidently identical with the mineral from the same locality 

 called by Mierisch kaliophilite (Tschermak's IMineral. petrograph. 

 Mittheilungen, vol. vni, p. 100). It occurs in acicular crystals which 

 are opti(;ally uniaxial, and probably belong to the hexagoual system. 

 They are colorless, have a hardness of G, and a specilic gravity of 

 2.493. An analysis yielded : 



Si02 Al-.0;j KM Na-iO 



:57.7:i :«.()'J 21). :w u.37 = 1.0.49. 



This agrees closely with the formula IvAlSiO, or K2O, AlaO.-;, 2Si02, 

 which is that given to kaliophilite. It falls into the same group with 

 nephelite which has an analogous formula, and also the lithiutn silicate 

 eucryptite. 



Griqualandite. — A name given by CI. Grant Hepburn to a variety of 

 the silicilied crocidolite from South Africa ; well known under the name 

 of tiger-eye. He regards it as a silicate of iron, but it is obviously not 

 a distinct mineral but an indefinite mixture of silica and hydrated iron 

 sesquioxide. (Chemical oSTews, May, 27, 1887.) 



Fiedler ite. — 8ce Laurionite. 



Eeiiophyllite. — A new chloro-arseuate of lead occurring with rhodo- 

 tilite (see below) at Pajsberg, Sweden. It has a i)ale sulphur yellow 

 color, and a foliated structure showing one distinct cleavage yielding 

 thin i)lates. These show an acute bisectrix in the polarisf'ope with sym- 

 metrical axial figure, from which it is safely concluded that it belongs 

 to the orthorliombic system. The hardness is 2, the specific gravity 

 6.88G; on the cleavage surface the luster is adamantine, elsewhere 

 vitreous. An analysis yielded: 



AS2O3 PbO MnO, FeO CI 



11. 69 t80. 70 0. 54 8. 00 = 100. ;i ; deduct O 1. 80 = 99. 13. 



This corresponds to th(> formula PbiASiOT + 21*1)01,., which requires 

 As2Onl2.03, PbO 81.28, CI 8.()3=101.94 (deduct 1.94=100). This min- 

 eral has essentially the composition of Xordenskiold's ecdemite from 

 Liiugban, but <liffers in form and is probably identical with a mineral 

 noted as occurring with ecdemite and at that time referred to the 

 orthorhombic system. (Described by G. Flink in G^fversigt Vet. Akad. 

 Fiirhandl. Stockhohn, 1888, j) 574.) 



Hiortdahlitc. — See Barkevikite. 



Hohmannite. — In specimens of copiapite from Caracoles, Bolivia, 

 Frenzel has identified a new iron sulphate, and perhaps two new species. 

 The mineral, named hohmannite after the discoverer, occurs in brown- 

 ish red fibrous aggregates having the optical characters of a tricliuic 



