130 ERCINITE. 



When purified, the salt is used as a pur- 

 gative medicine: the greater part of the 

 Epsom salts of commerce, however, is 

 manufactured from the Magnesian Lime- 

 stone of Yorkshire. 



Ercinite. See Harmotome. 



Erdiger Talc, Werner. See Nacrite. 



Erdiges Erdpech, Werner. Erdiges 

 Bergpech, Reuss. See Earthy Bitumen. 



Erdkobold, Werner. See Earthy Co- 

 balt. 



Erdmannite. a name which has been 

 given to Zircon found near Brevig in Nor- 

 way. It is composed of Silica 33-43, Zir- 

 conia with some iron and manganese 6597, 

 loss by ignition, &e., 0-70 -100-10. 



Eridol, Werner. See Naphtha and 

 Petroleum. 



Erdpech, Werner. See Bitumen. 



Erdwachs, Rammehberg. See Ozo- 

 cerite. 



Eremite, Shepard. A variety of Mona- 

 zite, found in minute crystals in a boulder 

 of albitic granite, in the north-eastern part 

 of Watertown, Connecticut, U.S. Colour 

 between clove- and yellowish-brown Semi- 

 transparent. Lustre resinous to vitreous. 

 Streak paler than the colour. Brittle. 

 Fracture conchoidal to uneven. H. 5 to 

 5 55. S.G. 3-714. 



Fig. 180. 



^ 



^W^ 



Name. From £§>»/«•'«, solitude, in allusion to 

 the isolated manner of its occurrence with re- 

 spect to other individuals of the same species. 



This name has been applied by Haiding:er 

 ;.uid Thomson to two minerals of very dif- 

 ferent composition. 



Erinite, Haidinger. Occurs in mammil- 

 lated crystalline groups, consisting of con- 

 centric coats, with a fibrous structure, and 

 rough surfaces formed by the ends of very 

 minute crystals. Colour brilliant emerald- 

 green, inclining to apple-green. Dull. Faintly 

 translucent at the edges. Streak same as 

 the colour, but paler. Brittle. Fracture un- 

 even, or imperfect conchoidal. H. 4-5 to 5. 

 S.G. 4-043. 



Comp. Cu^ As + 2 H=^ arsenic acid 34-7, 

 oxide of copper 59-9, water 5-4 = 100-0. 



Analysis, by Turner : 



Oxide of copper . . . 59-44 

 Arsenic acid. , . . 33-/8 



ERUBESCITE. 

 Alumina . . . .1-77 

 Water 5-01 



100-00 

 BB emits fumes of arsenic and melts. 

 Soluble in nitric acid. 

 Locality. County of Limerick, in Irelanr^. 

 Name. The name bears reference both to 

 the locality as well as to the characteristic 

 emerald-green colour. 



Only two specimens of this mineral have 

 been preserved, one of which is in the col- 

 lection of Mr. Greg. 



Erinite, Thomson. A compact, fine-grain- 

 ed variety of Bole, of a yellowish-red, or 

 sometimes greenish colour. Lustre slightly 

 resinous. Opaque. Feel soapv. Fracture 

 small-conchoidal. H. 1-75. S.G. 2-04. 

 Analysis, by Thomson : 



Silica 47-0 



Alumina .... 18*0 

 Protoxide of iron , . .6-4 

 Water , 25-0 



96-4 



BB whitens, but does not melt. 



Localities. — Lrish. In Co. Antrim, four 

 miles east of the Giant's Causeway, in amyg- 

 daloid ; Magee Island, at Dunluce Castle. 



Name. After Erin, the name for Ireland 

 in the native language. 



Erlamite, Breithaupt; Erlan. Gene- 

 rally occurs in small and fine granular con- 

 cretions of a pale greenish-grey colour, with 

 a dull or feebly shining lustre. Streak 

 white and shining, with a resinous lustre. 

 Fracture foliated, sometimes splintery. H. 5. 

 SG. 3-0 to 3-1. 



Analysis, by Gmelin ; 



Silica . 



. 53-16 



Alumina 



. 14-03 



Lime • 



. 14-39 



Soda . 



. 2-61 



Magnesia 



. 5-42 



Oxide of iron 



. 7-14 



Oxide of manganese 



. 0-64 



97-39 



BB fuses readily to a slightly coloured, 

 transparent globule; with borax yields a 

 clear greenish glass. 



Locality. The Saxon Erzgebirge, in gneiss. 



Erlamite strongly resembles Gehlenite in 

 appearance. It is probably only a mechani- 

 cal mixture. 



Ersbyite. The name given by A. E. 

 Nordenskiold to the anhydrous Scolecite of 

 Nordenskiold, the father, from Ersb}', in 

 Finland. 



Erubescite, Dana. Purple Copper. Cu- 



