SESQUIARSENIET. 



Serpentine, including Baltimorite, Chrysotile, 

 Metaxite, Picrolite. 4th, Foliated Serpentine, 

 comprising Antigorite, Marmolite, &c. 



The purer forms of Serpentine are called 

 by T, Sterry Hunt Normal Serpentine, and 

 other varieties Calcareous, Dolomitic, and 

 Magnesitic OphioUte, according to the nature 

 of the ingredient which may be present in 

 the Serpentine. 



Serpentine, though soft, takes a good 

 polish, and forms a very beautiful orna- 

 mental stone. It has long been converted 

 into various objects at Zoblitz ; and, within 

 the last few years, works have been esta- 

 blished in Cornwall, where, by the aid of 

 machiner}', it is made into columns, chimney- 

 pieces, vases, and other ornamental articles. 

 Formerly it was sent to Bristol in consider- 

 able quantities, where it was used in the 

 manufacture of carbonate of magnesia. 



Brit. Mus., Case 25. 



31. P. G. Irish Serpentine (Connemara 

 marble) in Hall; Pilasters 2, 7; Pedestal 

 43 ; Columns 24, 37 ; Tazza on column of 

 alabaster, 34 ; Cornish serpentine in Hall, 

 Pedestals 28, 36 ; Columns 30, 57 ; Screen 

 on eastern wall; Table- top A 24; Tazza on 

 Pedestal 32; Inlaid Table-top A 11, under 

 Case ly. Horse-shoe Case, Nos. 1066 to 

 1077, 1081 to 1084, 1092, 1093; Upper 

 Gallery, Wall-case 5. 



Sesquiakseniet OF feoN, Thomson. See' 

 Leucopyrite. 



Sesquicakbonate of Soda. See Trona. 



Sevbrite. a variety of Halloysite, oc- 

 curring in small masses,and somewhat resem- 

 bling Lithomarge. Colour white,without lus- 

 tre, but slightly translucent. Soft, yielding 

 easily to the knife, and receiving a high 

 degree of polish by friction. Adheres 

 strongly to the tongue. Fracture con- 

 choidal. 



The name is derived from the locality, 

 St. Sever, in France, where it is found in 

 the upper sandy deposits in tertiary Gypsum, 

 in masses from two to five inches in dia- 

 meter. 



Comp. Al Si + 2H. 



Analysis, by Pelletier : 



Silica 50 



Alumina . . . .22 



Water 26 



Loss 2 



100 

 Sexaluminate of Lead, TJiomson. See 

 Plombgomme. 



Seybertite. The name given by Clem- 



SIDEROPLESITE. 345 



son to Clintonite, occurring in beds of granu- 

 lar limestone, associated with Serpentine, at 

 Amity, New York. 



Shale, Kirwan. Is rather a rock than a 

 mineral, in the strict sense of the term, being 

 an argillaceous deposit, generally of a grey 

 or bluish colour, forming sometimes beds 

 of considerable thickness in many forma- 

 tions, especially the Coal-measures. It is 

 soft, earthy, and opaque, with a lamellar or 

 slaty structure, yields to the knife readily, 

 adheres to the tongue, and is meagre to the 

 touch. S.G. about 2-6. 



Shepardite. a meteoric mineral called 

 Schreibersite by Professor C. U. Shepard, 

 in compliment to whom the present name 

 was given by Haidinger. 



Shorl, Kirioan. See Schorl. 



Shorl Spar, Kirwan. Crystallized com- 

 mon Actinolite. 



Siberitb, A' name for Rubellite, or red 

 Tourmaline ; after Siberia, one of its locali- 

 ties, jfp'. 385, 



Fig. 385. 



Brit. Mus., Case 38. 



Siderite. a vitreous variety of Quartz, 

 of an indigo or Berlin-blue colour, from Coi- 

 ling, near Salzburg. 



Siderite, Greg ^ Lettsom, Haidinger, Ni- 

 col (From (rtlv^oi, iron,) Sparry iron. See 

 Chalybite. 



Siderite. A name sometimes given to 

 Cube Ore. See Pharmacosiderite. 



Siderite ai:^ant, Necker. Magnetic Iron 

 Ore. See Magnetite. 



Siderite chromifere, Necker. Chro- 

 mateofiron. See Chromic Iron. 



Siderite titanique, Necker. Titanate 

 of iron. See Ilmenite. 



Siderite zincifere, Necker. See Frank- 

 linite. 



SiDERiTiNE, Beudant. (From o-t^yi^os^ iron, 

 and pyi-rUyi, resin.) See Pitticite. 



SiDEROCLEPTE, Saussnre. A reddish crys- 

 talline mineral, with every appearance of an 

 altered substance, and occuring under the 

 same conditions as Chusite, 



SiDEROMELANE. (From <r;S--7fof, iron, and 

 f^ixx;, black.) An amorphous, ferruginous 

 Labradorite. 



SiDEROPLESiTE. The name given by 

 Breithaupt to a variety of Sparry Iron, the 

 composition of which is represented by the 



