^DELFORSITE. 



highest peaks named Adula, whence has 

 been derived the name Adularia. 



"Adulariais distinguished fi;om common 

 Felspar by its greenish-white colour, par- 

 ticular colour reflection, complete conchoidal 

 cross-fracture, lamellar distinct concretions, 

 its higher degree of transparency, and bv 

 the want of those rents which cross the 

 cleavage obliquely in common Felspar."— 

 Jameson, vol. i. p. 289. 



For varieties of Adularia, see Moonstone, 



SUNSTONE, VaI^ENCIANITE. 



Brit. Mus., Case 30. 



M. P. G. Horse-shoe Case, Nos. 955 to 

 959, 1039. 



^DELFOESiTE, Dana, V. Kobell Occurs 

 massive, and fibrous or feathery. Colour 

 White or greyish. Transparent or trans- 

 lucent at the edges. Lustre shining. H. 6. 

 S.G. 2-58. 



Comp. Neutral silicate of lime, or Ca 8i 

 = lime 37-8, silica 62-2 = 100. BB fuses 

 to a white translucent glass. Forms a jelly 

 with acids. 



Localities, ^delfors in Smaoland, Swe- 

 den ; Cjelleback in Norwav; Cziklovva, in 

 the Bannat. 



Brit. Mus., Case 25. 



.(Edelforsite, Retzius, NicoU ^dilite, 

 Kirwan : or Ked Zeolite of JEdelfors ; see 

 Ketzite. 



vEdilite : a variety of Prehnite from 

 .^delfors, in Sweden. 



JiGiRiNE; or J^^GYRiNE. Ablack or grecu- 

 ish-black to leek-greeuvarietv of Pyroxene, 

 allied to Arfvedsonite. Resembles Horn- 

 blende in outward appearance. H. 6-5 to 

 5-75. S.G. 3-432 to 3-504. 



Co)np. 5(k, Na, Ca, Mg, Mn, Fe) Si^. 



Analysis by Plantamour, from Esmark : 



Silica 46-57 



Alumina .... 341 

 Protoxide of manganese . 2-07 

 Protoxide of iron . . 24-38 



Titanic acid .... 2-02 

 Soda ..... 7-79 

 Potash .... 2-96 



Lime . . ■ . , . 5-91 

 Magnesia .... 5-81 

 Fluorine .... trace 



100-92 

 BB fuses to a black globule ; with a large 

 quantity of borax forms a green transparent 

 globule, with a still larger quantity a black 

 globule. 



Locality. Brevig in Xorway. 



Brit. Mus., Case 33, 



iEEosiTE, See Pykaegyrite. 



AGALMATOLITE. 3 



iEscHYNiTE, Berzelius, Phillips. Rhombic • 

 pnmary form an oblique rhombic prism. Oc- 

 curs in oblique rhombic prisms, terminated 

 by four-sided pyramids, which are generally 

 striated and imperfect. Colour nearly black, 

 inclining to brownish-yellow when translu- 

 cent. Opaque or translucent only at thin 

 edges. Lustre resinous. Fracture imper- 

 fect small conchoidal. H. 5 to 6. S.G. 5-14 

 to 1-5. 



Fig. 3. 



Fig. 4. 



Comp. Titanate of zirconia, and cerium. 



Analysis by Hartwall : 



Titanic acid . . . 25-9 



Zirconia .... 20-0 

 Peroxide of cerium . . 15-0 



Lime 3.3 



Peroxide of iron . . .2-6 

 Oxide of tin . . . .0-5 



97-8 



When heated evolves water and traces of 

 hydrofluoric acid. 



BB swells up and fuses, at the edges only, 

 to a black slag. With borax fuses readilv 

 to a dark yellow glass, which is colourles"3 

 when cool. With salt of phosphorus forms 

 a transparent colourless globule. 



_ Locality. The Ilmen range, near Miask, in 

 Siberia; imbedded in Felspar, and associ- 

 ated with Mica and Zircon. 



Name. The name (derived from a.l<r^vvx, 

 disgrace) given to this mineral by Berzelius,' 

 is in allusion to the inability of chemists, 

 at the time of its discovery, to separate the 

 two substances titanic acid and zirconia, 

 which enter into its composition. 

 Brit. Mus., Case 37. 



^TiTES, Pliny. Stones composed com- 

 monly of several crusts one within another, 

 and having in them cavities containing loose 

 and moveable matter ; either, flrst, solid and 

 stony, called a Callimus, or secondly, loose, as 

 sand, ochre, chalk, earth, &c., Geode; or 

 thirdly, liquid, Enhydros. (J. Woodward.) 

 Aftonite. See Aphthonite. 

 A.GALMATOLTTE, Phillips, is a clav or clay- 

 slate altered by heat, and by the acrion and 

 addition of alkalies contained in infiltrating 

 waters holding in solution alkaline silicates, 

 or carbonates derived from the decomposi- 



B A 



