22/04/2020 Musical Instruments
Commonly in yellowish-brown or reddish-brown, some in greyish-green color.
Vitreous luster. Its cleavage plane has nacreous luster or submetallic luster.
Monoclinic crystal, pseudo-hexagonal crystalline or short cylindrical model.
1.High insulating strength and large electrical resistance.
2.Low electrolyte loss.
3.Good arc-resistance and corona resistance.
4.High mechanical strength.
5.Resistant to high temperature and dramatic temperature changes.
6.Resistant to acid and alkali
Element SiO₂ Al₂O₃ K₂O Na₂O MgO CaO TiO₂ Fe₂O₃ S+P
Content（%） 40.6-48.5 10.8-19.8 8.2-9.8 0.6-0.7 20.5-23.8 0.4-0.6 0.8-0.9 1.5-7.5 0.02