MINERALOGY. 4fJ0 



The formula is coi)«(Mj[neiitly H2O, ISTazO, BeO, SSiO^, or IINa BeSisOR. 

 It is associated with aualcite, natrolite, and apopbyllite. (Brogger in 

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

 Foi'bandl. 1887, vol. ix, 434.) 



Facellite or PhacelUte. — Described by E. Scaccbi (Rend. Accad. Na- 

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

 ever, evidently identical with the mineral from tbe same locality 

 called by Mieriscb kaliopbilite (Tscbermak's Mineral, petrograpb. 

 Mittheilungen, vol. viii, p. 1(50). It occurs in acicnlar crystals which 

 are optically uniaxial, and probably belong to the hexagonal system. 

 They are colorless, have a hardness of G, and a specific gravit3' of 

 2.493. An analysis yielded : 



Si02 AI2O3 KiO NiiiO 



37.73 33.09 29.30 0.37 = 1,0.49. 



This agrees closely with the formula KAlSi04 or K3O, AI2O3, 2Si02, 

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

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

 eucryptite. 



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

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

 of tiger-ej^e. 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 I^ews, May, 27, 1887.) 



Fiedlerite. — Sec Lanrionite. 



Eeliophyllite. — A new chl or o- arsenate of lead occurring with rhodo- 

 tilite (see below) at Pajsberg, Sweden. It has a pale sulphur-yellow 

 color, and a foliated structure showing one distinct cleavage yielding 

 thin plates. These show an acute bisectrix in the polaris'^ope with sym- 

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

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

 6.886; on the cleavage surface the luster is adamantine, elsewhere 

 vitreous. An analysis yielded: 



AssOs PbO MnO.FeO CI 



11. 69 .80. 70 0. 54 8. 00 = 100. 3 ; deduct 1. 80 = 99. 13. 



This corresponds to tbe formula Pb4As207 -f 2PbCl.., which requires 

 As2O;il2.03, PbO 81.28, CI 8.63=101.94 (deduct 1.94=100). This min- 

 eral has essentially the composition of Nordenskiold's ecdemite from 

 Mngban, but differs 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 CEfversigt Vet. Akad. 

 Fiirhandl. Stockholm, 1888, ]) 574.) 



EiorfflaMitc. — See Barkevikite. 



Hohmamiite. — 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 triclinic 



