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Encyclopedia Britannica - Main :: SIV-SOU |
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SODALITE , a group of rock
Sodalite . Na4(AICI) Alz (SiO4) 3 Hatlynite (Naz, Ca)z(NaSO4.Al)Alz(SiOs)s Noselite Na4(NaSO4Al)Alz (SiO4)1 Lazurite Na4(NaSzAl)AIz(SiO4) 3 They are thus sodium (or calcium ) aluminium silicates, with chloride, sulphate or sulphide. In their orthosilicate formulae, as above written, and in their cubic crystalline form they present a certain resemblance to the members of the garnet group. Crystals usually have the form of the rhombic dodecahedron, and are often twinned with interpenetration on an octahedral plane. They are white, or often blue in colour, and have a vitreous lustre. The hardness is 51, and the specific gravity 2.2-2.4. These minerals are characteristic constituents of igneous rocks rich in soda, and they also occur in metamorphic limestones.The species sodalite (so named because it contains soda) occurs as well-formed, colourless crystals in the ejected limestone blocks of Monte Somma, Vesuvius
syenite
south
Litchfield
Dungannon
bright sky-blue colour and suitable for cutting as an ornamental stone. Recently, large masses with a pink
bright blue crystals and grains in the lavas (phonolite, tephrite, &c.) of Vesuvius
Eifel
Eifel
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