EUCLASTIC. 



Possesses double refraction. Rendered elec- 

 tric by pressure, a property which it retains 

 for many hours. Very brittle. Fracture 

 conchoidal. H. 7-5. S.G. 3-03 to 3-09. 



Co7np: 2Be5 Si + Al H'l^ = silica 

 alumina 82-40, glucina 23-92 = 100. 



43-68, 



Fig. 186. 



XXx 



W 



Analysis, by BerzeUus : 





Silica 



43-22 



Alumina . 



30-56 



Peroxide of iron 



2-22 



Glucina 



21-78 



Oxide of tin 



0-70 



98-40 



BB becomes opaque, swells up into a 

 cauliflower-like mass, and then melts to a 

 white enamel at the edges. 



Not acted on by acids. 



Localities. Eucfase was originally brought 

 from Peru by Dombej' ; it has since been 

 procured from Boa Vista and from Capao in 

 the mining district of Villa Rica, in Brazil, 

 where it occurs in chloritic slate resting on 

 sandstone. It is also found in the gold- 

 stream -works of the S. Ural, near the river 

 Sanarka, associated with Emerald, red 

 Corundum, Disthene, &c. Peru. 



Name. From £", easily, and x-Xa'tu, to 

 break, in allusion to its easy frangibility. 

 On that account, and from its rarity, it is 

 very seldom used in jewelry, for which it is 

 otherwise well suited from its hardness 

 (which exceeds that of TopazJ and the 

 high polish of which it is susceptible. 



Brit. Mus., Case 37. 



E UCLA STIC Disthene Spar, Haidinger. 

 See DiASPOHE. 



EuDlALlTE. Stromeyer ; EuDYAlJTE, 

 Phillips. Hexagonal. Primary form an 

 acute rhombohedron. Occurs in crystalline 

 masses sometimes exhibiting a tolerably 

 distinct double cleavage, and in cr3'stals de- 

 rived from a rhombohedron ; but the 

 crystals are generally small and irregular. 

 Colour red or brownish-red, presenting tints 

 like those of different varieties of Almandine 

 Garnet. Lustre vitreous. Sometimes trans- 

 parent, but usualh' cracked in every direc- 

 tion, and only transparent at thin edges 

 Streak white. Fracture subconchoidal or 

 splintery. H. 6. S.G. 2-9. 



Comp. 2K5 bi3 + ^r &i2 



EUKOLITE. 





Analysis, by Damour : 





Silica .... 



. 50-38 



Tantalic acid 



. 0-35 



Zirconia 



. 15-60 



Protoxide of iron . 



. 6-37 



Protoxide of manganese 



. 1-6] 



Lime .... 



. 9-23 



Soda .... 



. 13-10 



Chlorine 



. 1-48 



Volatile matters . 



. 1-25 



99-37 

 BB fuses tolerably easily to a greyish - 

 green enamel. 



When pulverized, soluble in muriatic acid 

 with the formation of a thick jelly of silica. 

 Locality. Kaugardluarsiik on the west 

 coast of Greenland, associated with Arfved- 

 sonite and Sodalite, or imbedded in white 

 Felspar. 



Name. From ty, easily, and ^'aXvu, to 

 dissolve ; in allusion to its easy solubility in 

 acids. 



Brit. Mus., Case 31. 



EuDNOPHiTE, TVeibye. A variety of 

 Anak'ime, found in white and greyish crys- 

 tals on the island Lamb, in Korway. It 

 occurs in syenite, associated with Leuco- 

 phane and Mosandrite. H. 5-5. S.G. 2-27. 

 Analysis (mean of two), by v. Borck ^ 

 Berlin : 



Silica 55-00 



Alumina .... 24-36 



Soda 14 06 



Water .... 8-23 



101-65 

 Name. From e^, well, and yvofa, a cloud, 

 or darkness. 



Brit. Mus., Case 28. 



EuGENEsiTE. See Selenpaliadite. 



EUGENGLANZ. See POLYBASITK. 



Euklas, Werner. See Euclase. 



EuKLASTic Disthene Spar, Haidinger. 

 See Diaspore. 



EuKOLiTE, Scheerer. Is found in reni- 

 form masses of a brown colour at Brevig, 

 and at Rodkindholm, near Fredericksvarn, 

 in Norwav. S.G. 3-01. 



Comp. 6R + ti+6Si. 





Analysis, by Damour ; 





Silica . . . , 



. 45-70 



Tantalic acid 



. 2-3.> 



Zirconia 



. 14-22 



Protoxide of iron . 



. 6-63 



Lime . 



. 9-16 



Oxide of cerium . 



. 2-49 



Oxide of lanthanium 



. 1-11 



Soda . 



> 11-59 



iv3 





