234 



MELLITE. 



Comp. U Si + 2 R3 isi^, 



or (Al J^e) bi + 



2(Ca, Mg, Xa, K) 'Hi^. 





Analysis, from Capo di Bove, b}' Damour . 



Silica . 



. 38-34 



Alumina 



. 8-61 



Peroxide of iron . 



. 10-02 



Lime . 



. 32-05 



IMagnesia 



. 6-71 



Soda . 



. 2-12 



Potash . 



. 1-51 



99-36 



BB fuses without effervescence to a green- 

 ish glass. 



When reduced to powder gelatinises with 

 nitric acid. 



Localities. Capo di Bove, near Rome, in 

 lava, with Nepheline, Pleonaste, &c. 



Name. From mel, honey, and ^iOo?^ stone, 

 in allusion to its colour. 



Brit. Mus., Case 36. 



Mellite, Brochant, Haily. Pyramidal : 

 primary form an octahedron with a square 

 base, in which it also occurs with the ter- 

 minal or lateral solid angles or edges re- 

 placed. Cleavage octahedral, indistinct. 

 Colour honey- or wax - yellow, reddish, 

 brownish. Lustre resinous, inclining to 

 vitreous. Transparent to translucent. Sec- 

 tile. Brittle. Fracture conchoidal. H. 2 to 

 2-5. S.G. 1-55 to 1-65. 



Fig. 286. 



Comp. M MS + 18H = alumina 14-32, mel- 

 litic acid 40*53, water 45*15 = 100. 

 Analysis, by Wohler : 



Alumina . . . . 14"5 

 Mellitic acid . . . .41-4 

 Water 44-1 



100-0 

 BB becomes opaque-white, with black 

 spots, emits no vapour, and a scarcely per- 

 ceptible odour, and is reduced to ashes with- 

 out showing any flame. 

 Soluble in nitric acid. 

 Localities. Arten, in Thuringia, and Lan- 

 genbogeii, in Prussian Saxony ; the mine of 

 Dmitrizwsk, in the district of iSertschinsk, in 

 Russia, in bituminous coal; Luschitz, near 

 Bilin, in Bohemia ; near Walchow, in Mo- 

 ravia. It occurs on bituminous wood and 



MENDIPITE. 



earthy coal, and is generally accompanied 

 by sulphur. 



Name. From mel, honey, because of its 

 honey -yellow colour. 



Brit.''Mus., Case 60. 



If. P. G. Horse-shoe Case, ISTo. 109. 



Melopsite. a yellowish or greenish- 

 white Lithomarge, from Neudeck, in Bo- 

 hemia, H. 2to3. S.p. 2-5 to 2-6. 



Menac. See Sphene. 



jMenacan, Werner ; MenaccANITE. A 

 vai-iety of Titaniferous Iron, occurring mas- 

 sive and in grains. Colour light iron-black 

 to steel-grey. Streak black. Fracture un- 

 even to flat -conchoidal. Magnetic. H. 5"5. 

 S.G. 4-7 to 4-8. 



Analysis, by v. Kobell : 



Titanic acid .... 43'24 

 Peroxide of iron . . . 28-66 

 Protoxide of u'on . . . 27*91 



100-00 



Localities. Cornwall ; in the bed of a 

 rivulet, at Tregonwell Mill, near Menaccan, 

 in grains and small angular fragments of 

 an iron -black colour; also in a stream at 

 Lanarth, St, Keverne ; near Gwendra, on 

 the south coast, in diallage rock. 



Name. After the locality, Menaccan, 

 where it was first observed. 



Brit. Mus., Case 37. 



3L P. G. Wall-case 13, on Principal 

 Floor. 



Menachanite, Kirwan, Jameson. Me- 

 nakanite, Brochant. See Menaccanite. 



Menacpiine Ore, Werner. \ See 



Menakerz, Werner. j Sphene. 



Mendipite, Breithaupt. Anorthic : pri- 

 mary form a right rhombic prism. Occurs 

 in crystalline masses, having a fibrous and 

 radiated columnar structure. Colour Avhite, 

 sometimes with a yellow or reddish tinge. 

 Feebly translucent to opaque. Lustre pearly 

 on cleavage faces. Streak white. H. 2-5 

 to 3. S.G. 7-077. 



Comp. Pb, CI + 2Pb = chloride of lead 3S-4, 

 oxide of lead 61-6 = 100. 



Analysis, from Churchill, by BerzeVms : 

 Oxide of lead . . . 60-18 

 Chloride of lead . . . 39-82 



100-00 

 BB decrepitates slightly when heated, 

 and appears yellower after cooling. Fuses 

 very readily. On charcoal is reduced with 

 evolution of acid vapours. 

 Easily soluble in nitric acid. 

 Localities. This rare mineral was princi- 

 pally found near Churchill, in the Mendip 



