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Common sodalite variety

2019-04-04

The sodalite stone belongs to semi-precious stone and is composed of the same β-characteristic cage. The β-cage is connected by a double six-membered ring to form an X-type zeolite, and a type A zeolite is formed by a double four-membered ring connection, and sodalite is formed by coplanar coupling.

黝方石: The crystal of 黝方石 is rare, showing a dodecahedron, mostly blocky or granular, with various colors ~ no, white, gray, light blue, etc., hardness 5.5 ~ 6. Usually crystals are embedded between volcanic rocks, and the mine shows a rare columnar crystal. Usually crystals are embedded between volcanic rocks, and the mine shows a rare columnar crystal.

Blue ash: English name hauyne a sodium-calcium aluminosilicate containing sulfate.

Chemical formula: na6ca[alsio4)6(so4), also written as (na,ca)4-8[a1si(o,s)4]6(so4,c1)1-2, often containing trace amounts of potassium. Isometric crystal system. The crystals are in the form of dodecahedrons or octahedrons, more often in the form of round grains and granular aggregates. Blue-deep sky blue, also white, gray, light yellow, light green, light red. Transparent - opaque. Glass - grease luster. Homogenization. The refractive index n is 1.495 to 1.505. Generally there is no luminescence, but a few have orange-red fluorescence under long-wave UV.

Hardness 5.5 to 6. Crisp. {110}Cleavage medium. The relative density is 2.40 to 2.50. Produced in alkaline volcanic rocks, occasionally in the contact zone between pegmatite and dolomite. Mainly produced in Italy, Vesuvius, Rhine, Colorado, Montana, Quebec, Canada and other places. Its transparent crystals can be used to grind jewels; opaque blocks can be used as lapis lazuli substitutes. Some people think that blue ash is one of the main constituent minerals of some lapis lazuli.

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