Characterization and Thermal Dehydration Kinetics of Highly Crystalline Mcallisterite, Synthesized at Low Temperatures

Table 5

Crystallographic data of synthesized mcallisterite and MgO(B₂O₃)₂.

Mineral name	Mcallisterite	Magnesium borate
pdf number	01-070-1902	01-076-0666
Chemical formula	Mg2(B6O7(OH)6)2⋅9(H2O)	MgO(B2O3)2
Molecular weight (g/mole)	768.56	179.55
Crystal system	Rhombohedral	Orthorhombic
Space group	Pr3c (No. 167)	Pbca (No. 61)
𝑎 (Å)	11.5490	13.7300
𝑏 (Å)	11.5490	7.9700
𝑐 (Å)	35.5670	8.6200
𝛼 (°)	90.00	90.00
𝛽 (°)	90.00	90.00
𝛾 (°)	120.00	90.00
𝑧	6.00	8.00
Density (calculated) (g⋅cm^−3)	1.86	2.53
Characteristic peaks 𝐼 (%)/2𝜃 (°)	100.0/10.139	100.0/22.291
	35.7/15.332	94.4/17.033
	32.9/31.875	80.9/19.921