SPH^RULITE. 

 BB fuses, with exfoliation and intumes- 

 cence. 



Forms a jelly with acids, owing to the 

 presence of the Mesolite. 



Localities. Iceland. The Faroe Islands. 

 Skye: at Storr, in minute spheroids on 

 Faroelite ; and at Quirang, in globules the 

 size of a pea. 



Sph^erulite, Jameson, Phillips; or 

 Sph^erulith. a form of Pearlstone, occur- 

 ring in small roundish or spherical concre- 

 tions, of a brown, yellow, and grey colour; 

 opaque, and without any regular cleavage. 

 The composition of the concretions is fel- 

 spathic, but they contain mixed Quartz, 

 which is most abundant at the centre and 

 in the outer layers. 

 Analysis, bv Delesse : 

 Sihca . ' . . . . 88-09 

 Alumina .... 6-03 

 Peroxide of iron . . . O'o8 



Lime 0-28 



Magnesia . ► . .1-65 

 Soda and potash . . .2-53 

 Water 0-84 



100-00 



BB almost infusible, the edges becoming 

 covered with a sort of enamel. 



Localities. The Shetland?, in soft friable 

 clay. Arran, with Pitchstone. Tharand and 

 Me'issen, in Saxonj^in Pitchstone.Brittany, 

 in bright yellow, botryoidal masses. Hun- 

 gary ; at Hlinik and Glashiltte, near Schem- 

 nitz, in ash-grey Pearlstone. Santorin in 

 Obsidian. Mexico. 



Brit. Mus., Case 38. 



M. P. G. Upper Gallerv, Wall-case 1, 

 Ifos. 62 and 53; Wall-case 2, Nos. 22 

 and 23. 



Sphalerite, Glocker. (From (r(pxXifos, 

 weak.) Sulphide of zinc. See Ble^ide. 



Sphen, Karsten; or Sphene, Phillips, 

 Hausmann, Haiiy. Oblique : primary form 

 an oblique rhombic prism. Occurs crystal- 

 lized, and sometimes in granular or foli- 

 ated masses. Colour brown, grey, yelloAv, 

 green, and black. Opaque, or translucent 

 at the edges to transparent. Lustre ada- 

 mantine, often inclining to resinous. Streak 

 greyish-white. Brittle. Fracture imperfect - 

 conchoidal. H. 5 to 5'5. S.G. 3-49 to 3-56. 



Fig. 401. 



Fig- 



402. 



Camp. Titanate and silicate of lime (or 



SPHRAGITE. 355 



a silicate of titanium, in which a part of the 



latter is replaced b3Mime) = Ca3 Si + Ti^ Si 

 = titanic acid 41-33, silica 30-45, lime 28-22 

 = 100. 

 Analysis, from Schwartzenstein, by Fuchs : 



Silica 32-52 



. Titanic acid .... 43-21 

 Lime 24-18 



9991 



BB swells up slightly, and fuses at the 

 edges to a dark glass; in borax dissolves 

 rather easily, forming a transparent yellow 

 glass ; with carbonate of soda yields a tur- 

 bid glass. 



Soluble in muriatic acid, which separates 

 silica in a bulky form, and containing titanic 

 acid — the lime, together with a portion of 

 the titanic acid, being dissolved. 



Localities. — English. Virtuous Lady IMine, 

 near Tavistock, in Devonshire, in Chlorite. 

 — Welsh. Fronolen, near Tremadoc. — 

 Scotch. Strontian,in syenite,/(7S.401 and 402, 

 in small hair-brown, or reddish-brown crys- 

 stals. King's House and Inverary, Argyle- 

 shire. Criffel Hills, Galloway. Craig Cail- 

 leach, Perthshire. The Shetlands. — Irish. 

 Co. Down, at Carriglinneen, and at Crow 

 Hill, near New r}'. — Foreign. Arendal, in 

 'Sovway, brown, and nearly opaque, in iron 

 ore. Malsjo, in Wermeland, Sweden. Sar- 

 lut, in Greenland. Near Slatoust, in the 

 Ural. Graubiindten, in the Grisons. St. 

 Gotthard,in mica-slate. Val Maggia, Pied- 

 mont, in brownish crystals on Chlorite. Mont 

 Blanc, and in many parts of the Alps. 

 Laacher See and Andernach, on the Rhine, 

 in volcanic rocks. (See Semelike and 

 Spixelline.) Grenville, and other places 

 in Canada. Sanford and Thurston, in Maine ; 

 Lee, Massachusetts, U. S. Brazil. 



Name. From a-<py,v, a wedge, in allusion to 

 the shape of the crystals. 



Brit. Mus., Case 37. 



Sphene occurs in the granites of Nor- 

 mandy,which are used for the Paris trottoirs. 

 The Obelisk of Luxor, formed of red syenite, 

 also contains numerous small yellowisla crys- 

 tals. See also Seme line. 



Sphenomite, C. U. Shepard. Occurs in 

 brownish-grey (with a tinge of yellow) thin 

 tabular crystals, implanted on crystals of 

 black Pyroxene, and associated with Anor- 

 thite, in the Juvenas Meteorite. 



Spherostilbite, Phillips. See Sph^- 



ROSTILBITE. 



Sphragide, Hausmann. \ (From <r(f^a.y);^ 

 Sphragite, Dvfrenoy. J a seal.) See 

 Lemnian Earth. 



A A 2 



