Sapphire is hard.
The hardness of sapphire is higher than that of crystal. If the hardness of diamond is 10, the hardness of sapphire is 9, and the hardness of crystal glass is 6~7.
The biggest feature of sapphire is its uneven color. It can be seen that there are straight color bands and growth lines arranged in parallel hexagonal cylinders with different depths. The lamellar twin crystal is developed, and the shutter twin crystal pattern is common. The cleavage is mostly split along the double crystal plane. Strong dichroism. In addition to the above common characteristics, sapphires from different origins in the world also have their own characteristics due to different origins. In the 1980s, many sapphire deposits were found in basalt along the eastern coast of China.
Which is harder, sapphire or crystal
The hardness of aquamarine is higher than that of crystal. If the hardness level of the diamond with the highest hardness known in nature is 10, the hardness of ruby and sapphire is 9, the crystal hardness is 6 to 7, the hardness of steel knife blade is 5.5, and the hardness of nail is 2.5. The Mozang drill, which has been stir fried a long time ago, is synthetic carborundum with a hardness of 9.25. Before the discovery of sapphire, watch glass was made of crystal.