Affordable grape stone

In the past one or two years, Grapevine has been loved by many designers in the world. The main reason is that in many natural gemstones with similar appearances of jade, the conditions of grapevine are the most advantageous. The fine texture of the grape stone, the elegant light green, the transparency of the watery, the appearance of the top ice jade, and the price is economical.

First, the origin of grape stone

The English name Prehnite is based on the late 18th century. The Dutch army colonel stationed in the Cape of Good Hope in Africa and the mineralist Hendrikvon Prehn discovered this mineral. After bringing it back to Europe, the surname of the school was Prehn. Because the mineral crystals extracted are mostly stalactite-like and spheroidal aggregates, which seem to result in a full-bodied white grape bunch, they are named after the grape stone in Asia.

Grape stones are a silicate mineral that usually appears in the voids of igneous rocks, sometimes on stalactites. The color of the grape stone ranges from light green to gray, as well as white, yellow and red, but the common color is green. Both transparent and translucent, they are in the form of plates, flakes, grapes, kidneys, radial or massive aggregates. Some of the grape stones have some structural textures or cracks interspersed between the grape granules. The shape of the plum blossoms on the epiphytic branches is called plum stone. The good quality grape stones can be used as gems. These gems are known as the Cape of Good Hope. green.

Second, the characteristics of grape stone minerals

Optical properties

Common colors are white, light yellow, flesh red, green, often light green, golden yellow most precious transparency transparent to translucent glossy glass luster light characteristic non-homogeneous body, biaxial crystal, positive light, often heterogeneous aggregate The refractive index is 1.616~1.649, and the spot measurement is usually 1.63 polychromaticity. There is no special optical effect. Cat eye effect (rare)

Chemical classification: silicate

Physical characteristics

Crystalline orthorhombic crystalline crystalline aggregate, often in the form of plates, flakes, grapes, kidneys, radial or massive aggregates. A complete set of medium to intermediate cleavage: complete cleavage; medium cleavage The collection is usually missing. Fracture-like fracture Mohs hardness 6~6.5 density 2.80g/cm3~2.95g/cm3

Third, the grape stone origin

1. Occurrence: According to the Asian Gemological Association (GIG) academic report: Grapevine is a secondary mineral formed by hydrothermal alteration, mainly produced in the pores and fissures of basalt and other basic eruptive rocks. It is often symbiotic with minerals such as zeolite minerals, Datolite, calcite and Pectolite. In addition, when some igneous rocks change, the calcium plagioclase inside can also be transformed into grapevine.

2. Origin:

(1) Foreign countries: the United States, Canada, France, Brazil, Australia, Scotland, Portugal, Italy, Russia, India, Japan, South Africa, Namibia, etc.

Green, aggregate with pupillary, glass luster (USA)

Light yellow green, columnar crystal form (India)

Light green, aggregated kidney shape (Morocco)

(2) Domestic: Cangzhou and Leshan in Sichuan Province

泸州葡萄石

Also known as the green stone, produced in the Yangtze River section of Zhangzhou. It is a basalt, the stone is dense, delicate and smooth, hard, mostly sub-circle, elliptical, gray, grayish green, light green and grayish black. The grape granules on the surface of the pebbles are embossed and flat. Generally, the particles are light in color, deep in color, clear in composition, and dense in particle size. Especially the green grape stone, known as the green pearl, is of great value.

Leshan grape stone

It is mainly produced in the Dadu River and the Lancang River Basin. It is also distributed in the Dadu River in Leshan City and in the Sanjiang Rapids where Leshan meets. It is a high-grade copper-bearing green shale. Leshan grape stone is a granular stone inlaid with small round stone. It is made up of magma pores filled with small copper ore. Because the degree of particles is higher than that of wrapped stone, the particles are highlighted after water sanding. Its grape granules are hard and round, rich in copper, and have a subtle shade of green and green.

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Description:

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Specification:

Our certificates:

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