MINERALOGY. 



541 



AzVRC- 



SME. 



{iota shining to glistening, and is pearly inclining to 

 vitreous. Fracture splintery. Translucent. Brittle, 

 and easily frangible. 



Constituent Parts Silica . 50 



Lime . 45 



Water . 5100 



Klaproth, Beit. b. iii. s. 291. 



GfOffiicstic and Geographic Situations. Europe. It 

 occurs in primitive rocks at Orawicza in the Bannat of 

 Temeswar, where it U associated with brown garnets, 

 blue-coloured calcareous-spar, tremolite, actynolite, and 

 variegated copper-ore, 



Ana. It has been lately discovered in the Island 

 of Ceylon, associated with cinnamon-stone, in gneiss. 



GENUS IX. AZURE-SPAR. 



Lazur Spath, Moht. 



Three axes. Cleavage prismatic and prismatoidal. 

 Blue. Hardness 5,0.0 6 5. Sp. gr. = 2.73.1. 



'1 his genus contains four specie*, viz. I'risinatic Azure- 

 spar, Prismatoidal Azure-Spar, Dodecahedral Azure- 

 spar, and Cakite. 



I. PRISMATIC AZURE-SPAR, Jameson. Prismatischer 

 Lazur Spath, M'.fii. 



Pyramid ui. known. Cleavage prismatic. Lively Blue 

 colour. Hardness = 5.0 5.5. This species contain* 

 two subspecies, viz. Azurite and Hauync. 

 FIRST SUBSPECIES. 



AZURITE, Jameson. Lazulit, Werner. 



External Characters. Colour blue. Occur* in small 

 massive portions, disseminated, and crystallized in very 

 oblique tour-sided prims, which are rather flatly acu- 

 minated on the extremities, with four planes, which are 

 et on the lateral edge*. Fracture uneven. Opaque, 

 or very techly translucent on the edges. 



gnostic Situation. It occurs imbedded in small 

 portion* in quartz : also in fissures in clay-slate, along 

 l>arry-iron, heavy-spar, and quartz. 



Geographic Situation. It occurs principally in the 

 district of Vorau in Stiria. 



StCONO SUBSPECIES. 



HACVNE, Jameton, Hauyn. Karsten. 

 External Charai ten. Colour blue. Occurs in imbed- 

 ded grains ; rarely crystallized. KxtmialU and inter- 

 nally alternate* from --[(Undent to ijli-tenitij;, and ln>trc 

 vitreoiM. Has a quintuple cleavat 'ure imper- 



fect conchoidal. Transparent and tr.i..-lui int. Brittle. 

 Very eily frangible. Scratches glass. Sp. gr. 2.687. 

 snot /ic ami Geographic S/t'i :lio it It occur* im- 

 bedded in the basalt rocks of Albano and Frascati, 

 along with mica, augite, leucite, and vesuvian : also in 

 the basalt of Andeniai-h. 



Prifmttoi- 2. PRISMATOIDAL AZURE SPAR, or BLWI SPAR, 

 Jameson 1'rismatoidischer Lazur Spath, Moht. Blau- 



Priimaiie 

 uure-tpv. 



Aiuritc. 



Haurn*. 



dal Azure- 

 Spar. 



spath, Werner. 



Pyramid unknown. Cleavage prismatoidal. Pale co. 

 lotirs. Hardness = 5.5 6.0. 



External Character*. Colour pale smalt-blue, which 

 sometimes passes into sky blue, and occasionally into 

 milk-white. Occurs massive and disseminated*. In- 

 ternally glistening, approaching to shining. Fracture 

 splintery. Translucent in a low degree. Yields a 



!i- white coloured streak. 



Chemical Characters. Before the blowpipe it be- 

 came* white and opaque ; and affords a black-coloured 

 glass with borax. 



Cotulituent Part/. Silica, . 1 4.00 



Alumina, . 71.00 

 Magnesia, . 5.00J 

 Lime, . 3.00" 



Potash, . 0.26 



Oxide of Iron, 0.75 



Water, . 5.0099.00 



Klaproth, Beit. b. ir. s. 85 



Geognottic and Geographic Situations It occurs Oryctojno. 

 along with quartz, mica, and garnets, in the valley of s y- 

 Murz, near Krieglach, in Stiria. -~-v~' 



3. DoDECAHEDRAL AzURE-SfAE Or LAPIS LAZULI, Dodecahe- 



Jameson. Lausurstein, Werner. dr al Azure- 



Tessular. Dodecahedral. Azure blue. Hardness 'P ar> 

 = 5 5 6.0. Sp.gr. = 2.95. 



External Characters. Colour azure-blue, of all de- 

 grees of intensity. Found massive, disseminated, in 

 rolled pieces, and in rhomboidal dodecahedrons. In- 

 ternally either glistening or' glimmering. Fracture 

 uneven. Feebly translucent on the edges. 

 Canst. Part* Silica, . 46.00 



Alumina, . . 14 50 

 Carbonate of Lime, 28.00 



Sulphate of Lime, 6.50 



Oxide of iron, . 3.00 



Water, . 200100 



Klaproth, b. i. s. 196. 



Geognostic and Geographic Situations. It occurs 

 in primitive limestone, along with iron-pyrites, in 

 Persia, Tartary, and China ; in veins that traverse 

 granite, along with quartz, mica, and iron-pyrites 

 in the Attain mountains; and at the southern end of 

 the Lake Baikal in Siberia, in a vein, associated with 

 garnets, mica, felspar, and iron-pyrites 



Vtes On account of its beautiful blue colour, and 

 the fine polish it is capable of receiving, it is much 

 prized by 1 ipidaries, and is cut into various ornamental 

 articles. It is highly valued by painters on account 

 of the fine ultramarine blue colour obtained from it. 



4. CALAITE, or MINERAL TLKQLOIS, Jameson and 

 Fischer. 



External Characters. Colours blue and green. Oc- 

 curs massive, disseminated, reniform, and botryoidal. 

 Internally dull, or feebly glistening and resinous. 

 Fracture imperfect conchoidal, or course-grained un- 

 even. Opaque Harder than felspar, but softer than 

 quartz. Streak white. -Specific gravity 2.860, 3.0, Fischer. 

 Conslit, Parts. Alumina, . 73 



Oxide of Copper, 450 



Water. 18. 



Oxide of Iron, . 4. 

 I-o-s . 050100. 



Jnhn, in Fischer's Essai sur la Turquoise, p 27. 

 Geognostic Si'uatt. n. It occurs in veins in clay iron- 

 stone, and also in small pieces in alluvial clay. 



Geographic Situation. It has hitherto been found 

 only in the neighbourhood of Nichabour in the Khoru- 

 san in Persia. 



L'set. lt is very highly prized as an ornamental 

 stone in Persia and the neighbouring countries. 



Order VI. 

 GEM. 



OEUKB VI. GEM. 



No metallic lustre. Streak white. Hardness ranges 

 from 5.5 to 10.0. At and below <j, the .specific gravity 

 is equal to 2.4 and less, and amorphous. The specific 

 gravity ranges from 1.9 to 4.7. 



GENUS I. BORACITE. BOSACITE. 



Many axes. Cleavage tessular. Harclnejs = 7.0. 

 Sp. gr. = 2.83.0. 



L HEXAIIEDRAL BORACITE, Jatieton. Borncite, Hcxahe- 

 Werner. Hexaedrischer Boracit, Moht. dral Bora - 



Tessular. Cleavage octahedral. 



External Characters. Colours white and grey. Oc- 

 cur* crystallized, in cubes, rhomboidal dodecahedrons 

 and tetrahedrons. Internally, shining and adamantine. 

 Fracture imperfect conchoidal. Translucent, and rare- 

 ly transparent. 



Physical Characters It is pyro-electric on all the 



angles, those that are diagonally opposite, being the one 

 positive, and the other negative. This electricity is 



