THE JfOXJfETALLIC JlUiEJiAUi. 205 



U/), [f^i^nmen Xo. f/MlT, U.H.N.M-], Caraallite ^ KCL, >I«Clj, 0H/> » [Speeiittenyo- 

 4</r^x r.H.N'.M.], IVinuate ^2^Mi^Ois;,MjzC\>[ffii«^.'iiiriCTi >'o.f>4742,r;..S. N.>L],aiid 

 iMt^aihunUi (2KCI, FeCl,, 2H/J). Tl»o«e of iseow*4ary {r>rT/iatioii, nmhiof! fn/m the 

 t\m/nu\i'mXiou of tlie priMiary miimnhi are, nine in nma\x^, namely; Kaimte ( KySO*, 

 MgH^>„ Mg<;i//H/>/; Hylvifj ^Ka> [Hi^-ufKai No. 6241d, r,S.N.>L]: TarAydrite 

 (fCaf;i„ 2M^;i, - 12IJ/^ [Hi*rrim«;rj No. 4ffi;j0, U.S.N.iL]: Bii^:hofit*r ' ' .'vO) 



[H[^5r.-ifw;n No. 62428, I.'. H. .V. ^f. ] : K rogjte ^ KyS^J«, iliriO,, -KaftO^, 21i . :j«ai 



No. 6242^>, r;.H.N..M.]; Rftj/;}iar'ltite Of)f?jO,, 7H/>;; fihuiltenXf: Ci>.S>,, NaySO*) 

 [Hj^^.'inwfri No. 4^/^29, r;.H.N.>L]; .S^.lionite ^fCjisO,, ifgSO^, 6H/J t [.Sperimeo No. 

 62418, i;.ff.N.M.],and AMrakanite '.Mjzf?<^>„4H/J; [Spe^nmftn No. f>47:iH, U.S.N.iL]. 

 <'>rjly four of t^l*«e mmerala \m\h suty cftmwarfwX valofe, namely: Camallite, Kainite, 

 K uri-hriUi, and nx.k Halt, Tfift yield of Jiora^-ite, which i* found in n««t#- in the cantallile 

 rejfjon of the mine, i* to^> in>fignifi/aint to be claimed among those jost mtsxtifjoed. 



The niinft wiay t* divid*^! chernirrally into four regions: (Ij The rock salt, (2j tlie 

 Kie»;rite, ^3; the Carnal liU;, (^4; the Kainite region. 



Thie rfxrk salt region lias almffnt the same ryjiuporition thrcn^aoat- Ite diazacter 

 Ih cryHtalline, though in this region well-defined crj-stak are never met with. In 

 other i*arti^ of the mine, efefie^rially in the Camallite region, it ii? faitand crystallised in 

 the fonn of the cul^M; [Hi^e^amen No. 40222, U-S.N.iL] and the octahedron, so mrt i m m 

 r/Aotir<^l different nYia/ldt-ot red and blue [^ijecimen No. 64731, U..S.N.>L]. Spedmoie 

 )jave aliiirj Vx«n found of varie^l Ktructure, laminated, granular, and fibrous [Specimen 



No. f^*7:«, t:..s.n..m.]. 



The dejKA'it lying on the top of the rock constitute* the go-called Kieeerite region- 



The thickneHi of this dei^orit is about 56 metres, and its average oc«npoati<Mi as 



follows: 



Percent. 



Kieserite 17 



Rfx.ksalt 66 



CanialliU; 13 



Tar.hyrlrite 3 



Anhydrite 2 



100 

 In the pure state Kif«erite is amorphou'- and translucent, ix.»S!e3sing a specific 

 gravity of 2.517. It c/mtainH HI. I ixtr cent sulpliate of magnesia and 12.9 percent 

 water, corres[ionding t^j the formula MgS<'>4, IIjO. Exposed to the air it becomes 

 of/a/jue from the alsi^^rjition of moisture, and is ry^nverte*^! into Epsom salts; 100 parts 

 of water diss^jlve 4^i.9 [/arts of this mineral at 18° C. The solution, however, takes 

 plar* very slowly at this tem[>erature. 



This de[x^it luis not Ix^en worked to any great extent. Its composition is interest- 

 ing as showing the graflual fhjf-rease of the projKirtion of common salt and the com- 

 menf*njent of the sei^aration of the more soluble salts. 



Vnutli of the two divisions of the mine jast descrilje^l contains only one mineral of 

 imjK^rtanrM^. The third division, calle^l the Camallite re^on, contains a variety 

 of minerals, and to this dejKMdt Stassfurt owes its world-wide fame. The average 

 thickness of this dejK^sit is about 25 metres, and its comj>osition is as follows: 



Per cent. 



Camallite 60 



Kies<irite 16 



Rrx;k salt 20 



Tachydrite 4 



besides small quantities of magnesium bromide. These minerals are deposited in 

 the order given above, in succ<*hive layers, varying in thickness from ^h; to 1 metre, 

 the different colours of these minerals giving the dejXfsit a remarkable appearance. 



