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Malachite jewelry is always mixed with other material. Malachite pewter necklace is beautiful. Malachite is a copper carbonate mineral, chemical composition of Cu2 [CO3] (OH) 2, CuO71.9%, CO219.9%, H2O8.15% it belongs to monoclinic. It always appears to be columnar or needle-like crystal form is very rare, usually hidden crystal bell was milky, massive, hull shape, tuberculosis-like and fibrous aggregates. A concentric layered, fiber radial structure. Green, malachite green, dark green and so on. Frequent pattern belt, silk or glass gloss sheen, it seems clear to opaque. Refractive index 1.66-1.91, double-refractive index of 0.25, polychroism colorless - yellow-green - dark green. Hardness 3.5-4.5, density 3.54-4.1g/cm3. Nature of brittle, conchoidal to uneven-shaped fracture. Case of hydrochloric acid react, and easy to dissolve.
Malachite and jade similar distinction.
Malachite green and peacock in a special band for identification of the typical characteristics, not easily confused with other precious stones, but with beryl, malachite similar to silicon. The difference is: Turquoise jewelry like turquoise necklace hardness, as a 5-6, low density, for 2.6-2.9g/cm3, refractive index is small, 1.62. Malachite hardness of silicon is small, the 2-4, density, as 2-2.4g/cm3, refractive index 1.57.
Malachite varieties and evaluation.
Varieties are common malachite, malachite gemstones, malachite, opal, green malachite. Malachite is a very rare gem malachite crystal jewelry. Malachite as ornamental stones, craft watch products, require bright colors, pure uniform, ribbon pattern with a clear, dense block without holes, the bigger the better. Malachite Opal requiring background is light zoning. Malachite can be carved heart-shaped pendant, egg-shaped ring face, necklace, can also be made of seal material.
Malachite maintenance.
Malachite stones do not durable, hardness, and can maintain a good luster a long time and can only be used as beads and brooches. The Russian people have malachite decoration materials used inside buildings, St. Isaac's Cathedral in Leningrad large garden pillar trimmed with malachite. Malachite is also used in carving a variety of worship supplies and decorations, fireplaces and desktop mosaic and so on.