Minéral du groupe des quartz
All minerals have a specific Minéral du groupe des quartz composition. The conversions between the alpha phases and the beta phases are as easily accomplished as in griupe alpha quartz - beta quartz conversions. Until then, it is not considered a mineral because minerals exclude man-made substances those substances are studied by metallurgists and chemists, not geologists. Nearly all Minerals are Minéral du groupe des quartz solids. At the higher temperatures the atoms move away from each other just enough to allow the bonds to unkink or straighten and produce the higher symmetry.