Diamond cubic strong isotropic property. Namely, for any two vertices "x" and "y" of the crystal net, and for any ordering of the edges adjacent to "x" and any ordering of the edges adjacent to "y", there is a net-preserving congruence taking "x" to "y" and each "x"-edge to the similarly ordered "y"-edge. Another (hypothetical) crystal with this property is the Laves graph (also called the K crystal, (10,3)-a, or the diamond twin). The compressive strength and hardness of diamond and various other materials, such as boron nitride, is attributed to the diamond cubic structure. Similarly truss systems that follow the diamond
Crystal habit (foliated/lamellar (layered), dendritic, bladed, acicular, lenticular, tabular (tablet shaped)). Crystal habit In mineralogy, crystal habit is the characteristic external shape of an individual crystal or crystal group. A single crystal's habit is a description of its general shape and its crystallographic forms, plus how well developed each form is. Recognizing the habit may help in identifying a mineral. When the faces are well-developed due to uncrowded growth a crystal is called "euhedral", one with partially developed faces is "subhedral", and one with undeveloped crystal faces is called "anhedral". The long axis of a euhedral quartz crystal typically has a six-sided