Mineral necessarily constant for all sides, which is a function of its structure; crystallographic weakness renders some directions softer than others. An example of this property exists in kyanite, which has a Mohs hardness of 5½ parallel to [001] but 7 parallel to [100]. The most common scale of measurement is the ordinal Mohs hardness scale. Defined by ten indicators, a mineral with a higher index scratches those below it. The scale ranges from talc, a phyllosilicate, to diamond, a carbon polymorph that is the hardest natural material. The scale is provided below: Lustre indicates how light reflects from the mineral's
Mohs (automobile) SafariKar was introduced in 1972, and was no less exotic than the Ostentatienne. SafariKars were aluminum bodied automobiles, the exterior of which were upholstered in Naugahyde (vinyl) stretched over foam padding. Doors for the vehicle opened outward from the body on linear rods, again for side impact protection. The vehicle had a retractable hard top system. Options for the SafariKar included a television, four-wheel drive, two-way radio and "butane furnace." Only three were produced, probably all in 1972 since an early Mohs publicity photograph shows all three in various stages of assembly. "Production" of the Safari Kar was listed in