MELANOCHROITE. 

 Analysis, from Frascati, by Karsten : 



Silica 34-60 



Alumina .... 455 

 Peroxide of iron . . . 28"15 

 Magnesia .... 0'65 

 Lime ..... 31*80 



99-75 



Comp. Ca2Si+FeSi. 



BB alone, fuses to a brilliant black glo- 

 bule ; with borax, difficultly to an impure 

 glass coloured green by iron. 



Localities. Norway." The Pyrenees. The 

 older lavas of Vesuvius, and the Papal 

 States, chiefly at St. Albano and Frascati, 

 near Rome. " The latter are locally called 

 Black Garnets of Frascati. 



Name. From i^i^-k;, black, in allusion to 

 its colour. 



Brit. Mus., Case 36. 



M. P. G. Upper Gallery, Table-case B, 

 in recess 6, No. 153. 



Melanochroite, Hermann, Dufrenoy. 

 In rhombic prisms, with two faces enlarged, 

 so as to impart to the crystal a tabular 

 form ; also massive. Colour between cochi- 

 neal- and hyacinth -red. Lustre resinous. 

 Translucent at the edges. Streak brick- 

 red. H. 3 to 3-5. S.G. 5-75. 



Comp. Chromate of lead, or Pb^ Cr2 = 

 protoxide of lead 76'7, chromic acid 23'3 = 

 100. 



Analysis, by Hermann : 

 Protoxide of lead . . . 76*69 

 Chromic acid . . . 23'31 



100-00 



BB decrepitates slightly when heated, 

 becoming for the time of a darker colour. 

 On charcoal fuses to a dark coloured mass, 

 •which becomes crystalline on cooling. In 

 the inner flame yields fumes of lead, lead 

 globules, and oxide of chrome. 



Locality. Beresow, in the Ural, in limestone, 

 •with Galena, Vauquelinlte, Crocoisite, &c. 



Name. From iu.ixcc;, black, and %?»«'', colour. 



Brit. Mus., Case 39. 



M. P. G. Principal Floor, Wall-case 21. 



Mblanolite, Wurtz. Resembles Chlo- 

 rite in appearance. Colour black. Opaque. 

 Streak dark olive-green. Structure colum- 



nar, with a striated sui 

 Analysis, by Wurtz 

 Silica . 

 Alumina 

 Peroxide of iron 

 Protoxide of iron 

 Soda . 



face. H. 2. S.G. 2-69. 



30-86 



3-92 



21-97 



21-97 



1-62 



MELLILITE. 



Carbonate of lime . .12-77 

 Water 8-94: 



233 



100-33 

 Locality. Milk Row Quarry, near Charles- 

 town, Massachusetts, U.S., coating the sides 

 of a iissure. 



Name. From ,a£X«?, black, and a/6i«?, stone. 

 Melanterie, Leymerie. Melanterite, 

 Haidinger, Greg ^ Lettsom. See Copperas. 

 The name is derived from Melanteria (from 

 !^i>M;, black), the term used by Plin}'- for 

 that mineral. 



Melinophane, T7i. Scheerer. Pyramidal 

 or hexagonal. Occurs massive, with a 

 scah^ and sometimes foliated structure. 

 Cleavage in one direction. Colour sulphur-, 

 lemon-, or honev-yellow. Lustre vitreous. 

 Brittle. H. 6. "S.G. 3-018. 

 Anali/sis, by R. Richter ; 



Silica 44-8 



Glucina 2*2 



Alumina .... 12-4 



Peroxide of manganese . . 1-4 

 Peroxide of iron . . . I'l 



Lime 31-5 



Magnesia , . . .0-2 



Soda 2-6 



Fluorine . . . .2-3 



Zirconia, oxide of chrome, 

 yttria, peroxide of nickel . 0-3 



98-8 



Locality. Near Frederioksvarn, Norway, 

 in zircon-syenite, with Elgeolite, Magnetic 

 Iron, Mica, &c. 



Melinose, Beudant, (from /^eX/vo?, pale 

 yellow.) See Wuleenite. 



Mellate of Alumina. See Meltjte. 



Mellate OF Iron. See Humboldtine. 

 This name was given by Breithaupt to 

 oxalate of iron, from its supposed composi- 

 tion. 



Mellilite, Kirwan. See Mellite. 



Mellilite, F. de Bellevue. Pyramidal : 

 Occurs in small square prisms, the lateral 

 edges of which are mostly replaced. Colour 

 yellowish-white, honey-j^ellow, or orange, 

 but generally covered externally with a 

 coating of oxide of iron. Lustre vitreous 



Fig. 285. 



or resinous. Translucent to opaque. Trans- 

 parent in thin laminae. Fracture uneven 

 to conchoidal. H. 5. S.G. 2-9 to 3-1. 



