114 DTASTALITE. 



Brit. Mus., Case 19. 



DiASTALiTE. A variety of Hornblende, 

 from Wermland. According to Breithaupt, 

 the angle of the prism differs one degree 

 from that of Hornblende. S.G 3-09 to 3-1. 



DiATOMOUS EUKLAS Haloid, Haidinger. 

 See Cobalt Bloom. 



DiATOMous Gypsum Haloid, Ilaid- 

 inger. See Haidingerite. 



DiATOMOUS HabronkmMalachit, 3Iohs. 

 See ApHANESiTfi. 



Dichromatic Euklas Haloid, Haid- 

 inger. See ViviANiTE. 



DicHLORiD OF Mercury, Thomson. See 

 Calomel. 



DiCHROiTE, Cordier. (From S;V,c?0M67e, and 

 x^o'toi^ colour). A name for lolite, in allusion 

 to its dichroism, or exhibition of different 

 colours when viewed in different directions. 



DiGENiTE, Breithaupt. A variety of 

 Copper-glance from Chili and Sangerhausea 

 in Thurnigia. S.G. 4o6 to 4'68. 



Comp. (I of Copper-glance and 3 of 

 Covelline). -C-u S4-3Cu S = Cu5 S*. 



Brit. Mus., Case 7. 



DiHYDRATE OF Alumina, Thomson. 

 See DiASPORE. 



DiHYDRiTE, Hermann. See Phosfho- 



CALCITE. 



DiixNiTE. A substance allied to Colly- 

 rite, found in the gangue of the Diaspore of 

 Schemnitz, in Hungary. It is white and 

 firm CH. 3-5), or earthy (H. 1-8 to 2) ; S.G. 

 2-57 to 2-83. 



Comp. A12 bi + 41 H = silica 24-39, 

 alumina 54-23, water 21-38 = 100. 

 Jinalysis by Karafiat : 



Silica ..... 23-53 

 Alumina .... 5300 



Lime 0-88 



Magnesia . . . .1-76 

 Water . . . . .20 05 



99-22 

 Name. After the village of Dilln, near 

 which it is found. 

 Brit. Mus., Case 26. 



DiMAGNETiTE, Shepard. A pseudo- 

 morph of Magnetite, found in slender rhom 

 bio prisms, at Monroe, Orange co.. New 

 York, U. S. Dana considers that the 

 mineral imitated is probably Lievrite; but 

 Heddle ascertaining certain needle-crystals, 

 usually considered to be Gbthite, which 

 occur in drusy cavities in the porpliyritic 

 trap of Gourock in Renfrewshire, to be 

 Magnetite, supposes them to be Dimagne- 

 tite, and infers that mineral to be a pseudo- 



DIOPSIDE. 

 morphous form after Gothite instead of 

 Lievrite. 



Brit. Mus., Case 14. 



DiMANTHOiD. Rolled Garnets somewhat 

 resembling Diamonrls in form. From Ni'gny 

 Tagilsk, ill theUr;diaii Mountains of Siberia. 



2M. P. G. Horse-shoe Case, No. 902. 



DiMORPHiNE, Orpiment found with 

 Realgar, so named by Scacchi, because he 

 considered it to be a particular sulphide of 

 arsenic susceptible of assuming incompatible 

 forms. 



Khombic, Crystals not exceeding half 

 a millimetre (-018 inch) in their longest 

 diameter. Colour orange-yellow; powder 

 saffron-yellow. Lustre adamantine. Trans- 

 lucent and transparent. Fragile. H. 1-5. 

 S.G. 3-58 



Comp. As4,S3 = arsenic 75 45, sulphur 

 24-55 = 100 00. 



Heatetl in a porcelain crucible affords an 

 agreeable odour and t rns red; with more 

 heat becomes brown, gives off yellow fumes, 

 and entirely evaporates: with soda gives 

 out an odour of garlic. 



Soluble in nitric acid. 



Localih/. Vesuvius ; in the fumaroles of 

 the Solf'atara, t'hlegrsean fields, near Naples. 



31. P .G. Upper Gallery, Table-case A 

 in recess 4, No. 147. 



Dinu'e. Meneghini. An organic com- 

 pound resembling ice in appearance, but 

 with a tinge of yellow due to a foreign 

 substance. It is met with forming aggre- 

 gations or druses of crystals, in a lignite 

 deposit at Lunigiana, in Tuscany. It is 

 inodorous and tasteless. Fra<;ile and easily 

 reduced to powde Insoluble in water; 

 slightly soluble in alcohol, but very soluble 

 in ether, and in sulphide of carbon. Fuses 

 with the warmth of the hand to a yellow- 

 ish oily-looking liquid ; which, on cooling, 

 forms large transparent crystals. 



Na 'le. After Frofessor Dini, by whom it 

 was first found. 



DioPslDE, Phillips, Nicol, Dana. A 

 variety ot Augite. Oblique : primary form 

 an oblique rlionibic prism, like that of 

 Augite. Occurs in prismatic crystals, which 

 are colourless or various shades of green; 

 and translucent or transparent. They are 

 generally striated longitudinally, have a 

 shining lustre, and may be cleaved parallel 

 with the planes of the primary prism. 

 Scarcely scratches glass. H. 5 to 6. S.G. 

 331. 



Comp. Monosilicate of lime and mag- 

 nesia, or Ca "si + Mg Si = lime 25-46, mag- 

 nesia 18-18, silica 56-36 = 100-00. 



