Is the hardness of mica large?
The hardness of quartz is 7, the hardness of feldspar is 6 - 6.5, and the hardness of mica is 2 - 3Hardness ranges from large to small: quartz, feldspar, and micamicaThe crystals are mainly monoclinic, crystalline in pseudo six - sides, flaky, scaly, plate-like, and sometimes pseudo - six - square. Hardness 2~3, specific gravity 2.70~3.20. The refractive index of mica increases with the increase of iron content, and can rise from low positive to middle protuberance. An iron free variety; colorless in flakes; the more iron, the deeper the color; and the increased colour and absorbency
. The local resistance of solids to the invasion of external objects is the index of soft and hard materials. There are different hardness standards due to different testing methods. The mechanical meanings of various hardness standards are different and can not be directly converted to each other, but they can be compared by experiment.
Hardness, physics, term in which materials resist the hard material pressing into its surface is called hardness.