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 are. 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 prismatic habit with parallel opposite faces. Aggregates can be formed of individual crystals with euhedral to anhedral grains. The arrangement of crystals within the aggregate can be characteristic of certain minerals. For 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. Recognizing the habit can aid in identification as some habits are characteristic. Most minerals, however, do not display ideal habits due to conditions during crystallization. Euhedral crystals formed in uncrowded conditions with no adjacent crystal grains are not common; more often faces are poorly formed or unformed against adjacent grains and the mineral's habit may not be easily recognized.

Habit

A habit (or wont) is a routine of behavior that is repeated regularly and tends to occur unconsciously.

In the American Journal of Psychology (1903) it is defined in this way: "A habit, from the standpoint of psychology, is a more or less fixed way of thinking, willing, or feeling acquired through previous repetition of a mental experience." Habitual behavior often goes unnoticed in persons exhibiting it, because a person does not need to engage in self-analysis when undertaking routine tasks. Habits are sometimes compulsory. The process by which new behaviours become automatic is habit formation. Old habits are hard to break and new habits are hard to form because the behavioural patterns we repeat are imprinted in our neural pathways, but it is possible to form new habits through repetition.

As behaviors are repeated in a consistent context, there is an incremental increase in the link between the context and the action. This increases the automaticity of the behavior in that context. Features of an automatic behavior are all or some of: efficiency, lack of awareness, unintentionality, uncontrollability.

Religious habit

A religious habit is a distinctive set of garments worn by members of a religious order. Traditionally some plain garb recognisable as a religious habit has also been worn by those leading the religious eremitic and anchoritic life, although in their case without conformity to a particular uniform style.

In the typical Roman Catholic or Anglican orders, the habit consists of a tunic covered by a scapular and cowl, with a hood for monks or friars and a veil for nuns; in other orders it may be a distinctive form of cassock for men, or a distinctive habit and veil for women. Modern habits are sometimes eschewed in favor of a simple business suit. Catholic Canon Law requires only that it be in some way identifiable so that the person may serve as a witness to Gospel values. This requires flexibility and creativity. For instance in Turkey, where religious garb is not allowed in public, a Franciscan might wear street clothes.

In many orders, the conclusion of postulancy and the beginning of the novitiate is marked by a ceremony, during which the new novice is accepted then clothed in the community's habit by the superior. In some cases the novice's habit will be somewhat different from the customary habit: for instance, in certain orders of women that use the veil, it is common for novices to wear a white veil while professed members wear black, or if the order generally wears white, the novice wears a grey veil. Among some Franciscan communities of men, novices wear a sort of overshirt over their tunic; Carthusian novices wear a black cloak over their white habit.

Habit (biology)

In zoology (particularly in ethology), habit usually refers to the behaviour of animals, instinctive or otherwise, though it also has broader application.

In botany habit is the form in which a given species of plant grows.

Behavior

In zoology, habit usually refers to a specific behavior pattern, either adopted, learned, pathological, innate, or directly related to physiology. For example:

Mode of life (or lifestyle, modus vivendi) is a concept related to habit, and it sometimes is referred to as the habit of an animal. It may refer to the locomotor capabilities, as in "(motile habit", sessile, errant, sedentary), feeding behaviour and mechanisms, nutrition mode (free-living, parasitic, holozoic, saprotrophic, trophic type), type of habitat (terrestrial, arboreal, aquatic, marine, freshwater, seawater, benthic, pelagic, nektonic, planktonic, etc.), period of activity (diurnal, nocturnal), types of ecological interaction, etc.