A process for converting gaseous alkanes to liquid hydrocarbons wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The first electrical terminal and the second electrical terminal are crosswise assembled in the mating pillar to make the first contact arms and the second contact arms provide elastic clamping forces from four directions. The slidable members are configured for holding optical members. A tab protrudes from the first end of the faceplate at a front of the faceplate. The invention furthermore describes dispersions which contain such rod-shaped apatite crystals, and a process for the preparation of the dispersions or of the apatite crystals. Also, the support member is spaced apart from the surface of the vehicle console that defines the upper openings.