Table 3: d-spaces of strongest diffraction peaks for crystalline cristobalite, quartz and Mg-silicates, different entries for orthorhombic enstatite correspond to variations in the size of the unit cell due to multiply-linked chain structures.

Mineral	d (Å)	hkl-index
Cristobalite	4.0474	101
Quartz	3.3436	101
Forsterite	2.4557	112
Monoclinic
Enstatite	2.9808	22-1
Orthorhombic
Enstatite 1	2.4338	112
Enstatite 2	3.1486	221
Enstatite 3	3.0745	121