First of all, it's very light, and you can feel the low density when you pick it up. Then, one thing, if you scratch on paper or porcelain, you will leave dark chocolate stripes. If it is other imitation, only black or white stripes will be left. Stripe test is of great significance to distinguish coal concentrate.
In addition, you can see the original structure similar to wood on the coal concentrate, which will generate static electricity after strong friction.
Due to the different burial time and pithead, most of the high ancient coal concentrates will form dark red and transitional colors, showing black gray, gray white, olive and other pithead colors. The high ancient fine coal decoration with holes can be observed through a high magnification magnifying glass, and thin spiral lines or traces of use in the holes can be seen.
Extended data:
Coal concentrate is characterized by fine texture, no particles, light and tough, black and shiny, strong luster, and its technological value is extremely high.
Many cultural relics of Xiajiadian lower culture in Chifeng, Inner Mongolia use this material. Xiajiadian's lower cultural remains date back 4000-3000 years, which is equivalent to Xia and Shang Dynasties in the Central Plains. ?
A large number of exquisite coal decorations have been found and unearthed in Xiajiadian cultural site, among which tube beads, sheet beads, bamboo joints, abacus and double holes are the most. Carve decorations with animals and plants, totems and imitations.
Coal essence is very rare in the world, and handicrafts carved with coal essence are more valuable for collection and appreciation, and are also good gifts for relatives and friends.