A breach is material if, as a result of the breaching partyâs failure to perform some aspect of the contract, the other party receives something substantially different from what the contract specified.
In mineralogy, crystal habit is the characteristic external shape of an individual crystal or groups of crystals. A single crystal's habit is a description of its general shape and its crystallographic forms, plus how well developed each are.Recognizing the habit may help in identifying a mineral.or example, minerals used for asbestos insulation often grow in a fibrous habit, a mass of very fine fibers. The terms used by mineralogists to report crystal habits describe the typical appearance of an ideal mineral.
Pegmatite containing lepidolite, tourmaline, and quartz from the White Elephant Mine in the Black Hills, South Dakota. A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic.Most pegmatites are composed of quartz, feldspar and mica, having a similar basic composition as granite.rystal size is the most striking feature of pegmatites, with crystals usually over 5 cm in size. Individual crystals over 10 metres across have been found, and many of the world's largest crystals were found within pegmatites. These include, spodumene, microcline, beryl, and tourmaline.