SAUALPITE. 



semblance to Cat's Eye, but is of a much 

 softer nature. 



The name Satin Spar is also given to a 

 fibrous variety of Aragonite, which, when 

 polished, has a satiny lustre, and is on that 

 account employed in the manufacture of 

 ornaments. It is found at Dufton, in Cum- 

 berland, in thin veins, traversing shale, and 

 generally accompanied by Iron Pyrites. 

 The spar from this locality contains 4*25 

 per cent, of carbonate of manganese, which 

 sometimes communicates to it a roseate 

 tinge. It is also met with, of snowy white- 

 ness, in Buckinghamshire ; Devonshire ; and 

 at Leadhills, in Scotland ; in Dirk Hatterick's 

 Cave, in Galloway ; and in the Orkneys ; in 

 the island of Pharay, and at Rackwick, in 

 Hoy. 



Brit. Mus., Case 45. 



31. P. G. Horse-shoe Case, Nos. 295 to 

 300. 



Saualpite a name proposed for the so- 

 called Zoisite, from the Saualp, in Carin- 

 thia, which has been separated from Epidote, 

 by Brooke, on crystallographic grounds, and 

 formed into a separate species, 



Savite, 3Ienegheni. Pyramidal. Occurs 

 in radiating, acicular, rectangular prisms, 

 which are either truncated or with pyrami- 

 dal terminations. Colourless, and trans- 

 parent, Avith a vitreous lustre. H. 3. 

 S.G. 2-45. 



Comp. (Mg Na)3 &> + A\ Si + 2H. 



Analysis, by Bechi : 



Silica 49-17 



Alumina .... 19'66 

 Magnesia .... 13-50 



Soda 10-52 



Potash 1-23 



Water 6-57 



100-65 



Locality. Tuscany, in gabbro rosso, as- 

 sociated with Picranalcime, 



Name. After Mons. Savi. 



Savite, according to Q. Sella, has the same 

 angles and crystalline tbrm as Natrolite, of 

 which mineral it is, probably, only a variety. 



Savon de Montagne, Brochant, Beu- 

 dant. See Rock Soap. 



Savon de Yerriers. A name given 

 by the French to Pyrolusite. in consequence 

 of its being largely used in the manufacture 

 of glass, for the 'purpose of getting rid of 

 the brown and green tints and the colour- 

 ing matters contained in the materials em- 

 ployed. 



Saussueite. a compact Epidote, form- 

 ing the Jade of the Swiss Alps. Occurs in 



SAUSSURITE. 333 



greenish -white, mountain- green, or ash- 

 grey coloured masses. Cleavage in two 

 directions. Translucent at the edges. Lustre 

 pearly, inclining to vitreous on faces of 

 cleavage : sometimes resinous, especially in 

 massiA-e varieties. Streak white. Unctuous 

 to the touch. Extremely tough. Fracture 

 splintery to uneven. H. 7. S.G. 3-25 to 

 3-38. 



Comp. (R + if) Si. 



Analysis, from Monte Rosa, by T. Sterry 

 Hunt: 



Silica ..... 43*59 

 Alumina ..... 27-72 

 Peroxide of iron . . . 2-61 



Lime 19'71 



Magnesia .... 2-98 



Soda 3-08 



Loss by ignition . . .0-35 



100-04 



BB fuses with difficulty to a greenish 

 glass. 



Not acted on by acids. 



Localities. — English. Said to occur in 

 CornAvall, at Kynance Cove, Coverack Cove, 

 and the Lizard"!— Scotch. Glen Tilt, Perth- 

 shire. Portsoy, Banffshire. — Foreign. Ori- 

 ginally discovered by Saussure, in rounded 

 masses on the borders of the lake of Geneva. 

 Monte Rosa, and its vicinity. Corsica. 

 Greenland Madras, &c. 



With Augite and Hornblende, it con- 

 stitutes the rocks called Gabbro and Eupho- 

 tide. 



Name. After H, B. De Saussure, the 

 Swiss geologist. 



Brit. Mus., Case 31. 



Saussurite may be distinguished from 

 Augite and Diallage, by greater toughness 

 and less decided cleavage. 



Analyses of the Saussurites of Mont 

 Genevre and Orezza by Boulanger give the 

 composition of a compact Lime-alumina 

 Epidote (or Zoisite), containing small por- 

 tions of magnesia and soda; and the more 

 recent analysis of a fragment from Monte 

 Rosa, by T! Sterry Hunt, affords the same 

 result. 



Saussurite is nearly related to the massive 

 White Garnet from the Green Mountains, in 

 Canada, which, mixed with Serpentine and 

 Hornblende, gives rise to varieties of rocks 

 resembling certain Euphotides. (T. Sterry 

 Hunt.) 



Dana, Beudant, Bischoff, Delesse, and 

 other modern mineralogists, have referred 

 Saussurite to Labradorite or some other 



