. 2015 Sep 30;8(10):6719–6727. doi: 10.3390/ma8105335

Table 3.

Chemical composition of basalt fiber.

SiO₂	Al₂O₃	B₂O	CaO	MgO	NaO + K₂O	TiO₂	Fe₂O₃ + FeO
48–59	15–18	< 1	6–9	3–5	4–5	0.8–2.3	7–12