GLOSSAEY OF MINERALOGY. 



ABICHITE. 

 Abichite, Haidinger. See Clinoclase. 

 Abrazitb, Breislak, Brocchi. See Gis- 



MONDINE. 



AcADiALiTE or AcADiOLiTE. A Variety 

 of Chabazite, probably containing an ad- 

 mixture of Quartz. The colour (wine-yellow 

 or flesh-red passing into white) is arranged 

 in a tesselated manner in some crystals, the 

 angles being almost colourless. 

 Analysis by Hayes : 



Silica 52-02 



Alumina .... 17-88 



Lime 4-24 



Soda ..... 4-07 



Potash 3-03 



Water 18-30 



99-54 

 The word Acadialite is derived from a former 

 name, of Nova Scotia, where the mineral is 

 found. 



ACANTHO'lDE, Dufl'enoy (from a.y.ix.vij'x,, a 



spine). A mineral apparently related to 

 Breislakite occurring in dark brown fibres 

 passing into reddish-brown, disseminated 

 in lava; and in very slender and silky, 

 whitish needles in a Vesuvian lava erupted 

 in 1821. 



AcANTicoNiTE, Daiidrada. See Aren- 

 DALiTE. This name is derived from ay^mdi;, 

 a goldfinch, and xovi?, poivder, because the 

 yellow colour of the powdered mineral re- 

 sembles that of the plume of a goldfinch. 



Aceroese, Beudant. See Grey Oxide of 

 Manganese. From a^je^Sv-^, unprofitable, 

 because it is of but little use in thie arts, 

 compared with Pyrolusite, which it greatly 

 resembles. 



Achates or 'A^am; '■ the name by which 

 the Agate was known to the ancient Greeks. 

 According to Theophrastus (lviii.) it was 

 so called after the river Achates in Sicily, 

 where probably it was first discovered. 



ACHMITE. 



AcHiRiTE, the name given by Werner to 

 Dioptase after Achir Mamed, a Bucharian 

 merchant, who first brought the stone from 

 Siberia, and endeavoured to sell it for Eme- 

 rald. 



AcHMATiT, Hermann. A variety of lime- 

 and-iron-Epidote, from Achmatowsk. See 



BUCKLANDITE. 



AcHMiTE, Berzelius, Beudant, Dana, 

 Nicol, Phillips. 



Oblique • primary form an oblique rhom- 

 bic prism. Isomorphous with Augite. Co- 

 lour brownish, or reddish-brown. Opaque ; 

 translucent in thin fragments, which ex- 

 hibit a yellowish-brown tint by transmitted 

 light. Lustre vitreous, inclining to resin- 

 ous. Streak pale yellowish-grey. Brittle. 

 Fracture imperfect conchoidal. H. 6 to 6-5. 

 S. G. 3-5 to 3-6. 



Fig. 1. 



M 



Comp. Na Si + Fe Sl2 = Silica 55-07, Per- 

 oxide of iron, 32-4, Soda, 12-6 = 100. 



nalysis by Lehunt : 





Silica .... 



. 56-02 



Peroxide of iron . 



. 28-08 



Protoxide of manganese 



. 3-49 



Soda .... 



. 13-33 



Lime .... 



. 0-89 



Magnesia . 



. 0-50 



Alumina , 



. 0-69 



103-00 



