gagate; black amber; jet
an advanced coal. Also known as coal jade. The asphalt has a bright, metallic luster, black, dense, toughness. Lighter than the average coal. Present in the asphalt rock was isolated massive body or folder in the coal seam between. The jet, can be used for the production of arts and crafts, carving crafts and decorations, some people call it the carving lacquer coal. The main producing area in China Fushun.
, Identification characteristics:
1. Chemical composition: carbon, there is a small amount of hydrogen, oxygen, sulfur and so on.
2. Structure: amorphous, dense structure.
3. Hardness :3-to 4
4. To SG :1.3-1 .4
5. Fracture: a flat-shaped, conchoidal
the 6. Luster: Asphalt gloss resin gloss
7. Transparency: the opaque
8. Color: Black, brown black
the 9. RI :1.64-1 .68, average 1.66
10. Luminescence: UV, X-ray under inert
11. Thermal test: burning charcoal flavor, and have some thermoplastics. The
two jet, imitations the identification
refractive index of 1.66 3-4
Mohs hardness 1.30-1.40
relative density of brittle
cut sexual touch can be cut, warm needle touch exploration soot taste
the other points-brown powder, not pollute Hand
three jet, the identification of
imitation goods, such as: glass, plastic, vulcanized rubber, coal, and so on
most of the jet, from England White than the 19th century near the Yorkshire coast really Meijing on the market today are generally re-polishing and modification of the jet,
jet, there are a few very simple detection method
First light, pick-up You can feel the density is very small world pie network information .
2 then there is little take it in the paper or porcelain program will leave a streak of dark chocolate. If the other imitations, only leaving a black or white streaks. Streak test and identification of significance to the jet, it is worth a try.
3 In addition you can see in the jet, on the original structure that is similar to the wood. After
4 strong friction with static
inside wire fixed to look at this sculpture specifically what form, and the sculpture is not quickly broken repaired. More likely to be plastic intersects a kind of imitation goods. Can observe the appearance of mold marks World Pipe network informed, is the pressing process left behind a small mark, and the swirl pattern like the seasoning did not stir the feeling. The other is similar to the bubble surface of a small pit.