What are the jade similar to sodalite:
Sodalite is similar in color to lapis lazuli, but it can be distinguished according to the structure: sodalite is a coarse crystalline structure, lapis lazuli is mostly granular, and sodalite is usually white or pale pink veins. White calcite of lapis lazuli. The sodalite is often irregular plaque, and the pyrite inclusions are rarely seen in sodalite, while the lapis lazuli is the opposite; the sodalite sometimes shows cleavage, the lapis lazuli does not have cleavage, sodalite The transparency is higher than that of lapis lazuli; the relative density of sodalite (2.15-2.35) is significantly lower than that of lapis lazuli (2.7-2.9), which is sufficient to distinguish them.
Blue line quartzite: semi-transparent, glassy, ​​layered structure, blue thin layer containing fibrous blue line stone mineral and quartz-rich blue-gray interlayer appear, the refractive index is higher, 1.53, relative density The height is 3.30. Metal inclusions may appear, but unlike pyrite in lapis, the mineral inclusions in the blue quartz quartzite are gray
Dyeing Jasper: Also known as Swiss lapis lazuli, the color distribution in dyed jasper is uneven, the color is enriched in streaks and plaques, there is no pyrite, the fracture is shell-like; the reddish brown is usually not displayed under the Charles filter; the relative density Lower (2.6g); when the streak test, the streaks of lapis lazuli are usually light blue, while jasper has a high hardness and no streaks.
Sintered synthetic spinel: bright blue, uniform color distribution, granular structure, fine gold spots to mimic pyrite, much stronger gloss than lapis lazuli, and usually polished well. Observed by the Charles filter, the material is bright red, which is completely different from the sapphire reddish brown, which is enough to distinguish the two materials. The refractive index (1.72) and relative density (3.52) are higher than lapis lazuli and have a typical cobalt spectrum.
Synthetic lapis lazuli: An artificial lapis lazuli material manufactured and sold by Gilson, which is actually a replica, not a true synthetic material, and contains more aqueous zinc phosphate.
The identification of this material with lapis lazuli can be carried out in the following ways:
(1) Transparency: Natural lapis lazuli is micro-transparent, and the light can pass through the edge of the curved gemstone. The “synthetic†lapis lazuli is opaque, and there is no blue halo on the edge of the light.
(2) Color: Most natural lapis lazuli has uneven color, while "synthetic" lapis lazuli has a uniform color distribution.
(3) Inclusions: “Synthetic†lapis lazuli may also contain pyrite inclusions, which are obtained by pulverizing natural pyrite materials and then adding them to the powder raw materials, which are generally evenly distributed in the whole material and are in the form of crumbs. Pyrite in natural materials appears as small patches or streaks with irregular contours.
(4) Relative density: The relative density of synthetic lapis lazuli is lower than that of natural materials, generally less than 2.45, and the porosity is high. After being put in water for a period of time, the weight will increase, which is particularly effective for the identification of gemstones.
Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
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