270 DESCRIPTIONS OF MINERALS. 
elaion, oil. Altered crystals are in part the mineral Gie- 
seckite. 
Diff. Distinguished from scapolite and feldspar by the 
greasy lustre when massive, and its forming a jelly with 
acids ; from apatite by the last character, and also its hard- 
ness. 
Obs. Nephelite is the prominent constituent of nephelin- 
doleryte or nephelinyte, and phonolyte, and occurs also in 
some other eruptive rocks; and it also enters into the con- 
stitution of miascyte, zircon-syenyte, metamorphic rocks. 
Among the localities are Vesuvius and ©. di Bove, in Italy ; 
Katzenbuckel, near Heidelberg; Aussig in Bohemia; and 
as eleolite, Brevig, Norway; in Siberia; in the Ozark 
Mountains, Arkansas ; in Litchfield, Maine. 
Cancrinite. Crystals like those of nephelite, and compo- 
sition similar, except the presence of some carbonates and 
usually water. Color white, gray, yellow, green, blue, or 
reddish; Hi; =—=o-6. (Gs=2-4= 2-5. On account of the car- 
bonates it effervesces in acids. B.B. fuses very easily. 
Occurs in crystalline rocks at Miask in the Ural; in Nor- 
way; Transylvania; and at Litchfield in Maine, with eleo- 
lite and sodalite. Supposed to be altered nephelite. 
Microsommite is near. Sommite (nephelite). 
Sodalite. 
Isometric. In dodecahedrons; cleavage dodecahedral. 
Color brown, gray, or blue. H.=6. G.=2°25-2:3. 
Composition. Na, Al O; Si, +4 Na Cl=Silica 37-1, alumina 
31-7, soda 19:2, sodium ‘4 is chlorine 7-3=100. B.B. fuses 
with intumescence to a colorless glass. Decomposed by hy- 
drochloric acid, and the solution gelatinizes on evaporation. 
Occurs in eruptive and metamorphic rocks. Found in Si- 
cily ; near Lake Laach ; at Miask ; in Norway ; West Green- 
land ; of a blue color at Litchfield, Me.; and lavender-blue 
at Salem, Mass. 
Haitynite (or Hauyne) and Nosite (or Nosean) are related minerals 
from lavas or other eruptive rocks ; and Jtinerite is altered haiiynite 
or nosite. Isometric. In dodecahedrons. Color bright blue, occasion- 
ally greenish. ‘Transparent to translucent. H.=6. G.=2 A255, 
Lapis-Lazuli.— Ultramarine. 
Isometric. In dodecahedrons; cleavage imperfect. Usual- 
ly massive. Color rich Berlin or azure “blue. Lustre vitre- 
ous. ‘Translucent to opaque. H.=5°5. G.=2:3-2°5. 
