Crystal Morphology

Study of external crystal shapes, habits, and forms, including their relationship to internal structure and growth conditions

Level
basic
Languages
en → en
Cards
46
Markdown
Crystal Morphology (.md)

Flashcards (46)

#Front (Term / Question)Back (Definition / Answer)ExampleMultiple-Choice Options
1What is the relationship between crystal size and growth rate?Generally, larger crystals grow more slowly than smaller ones due to increased competition for available resources.
2What is 'acicular' crystal habit?Acicular habit describes needle-like crystals that are elongated and slender.
3Explain the term 'cleavage' in relation to crystals.Cleavage is the tendency of a crystal to break along specific planes of weakness, reflecting its internal atomic structure.
4What is 'sublimation' in the context of crystal growth?Sublimation is the process where a solid transitions directly to a gas, which can lead to the formation of crystals in certain conditions.
5What is the significance of symmetry in crystal morphology?Symmetry in crystal morphology helps classify crystals and predict their physical properties and behaviors.
6Name the seven crystal systems.The seven crystal systems are cubic, tetragonal, orthorhombic, hexagonal, trigonal, monoclinic, and triclinic.
7What is the role of solvent in crystal growth?The solvent can influence the solubility of the solute and the rate of crystal growth, affecting the final morphology.
8What are the primary factors influencing crystal morphology?The primary factors include temperature, pressure, chemical composition, and the rate of crystal growth.
9What is 'vapor deposition' in crystal formation?Vapor deposition is a method of crystal growth where vaporized material condenses onto a substrate to form a crystal.
10What does 'tabular' crystal habit refer to?Tabular habit refers to flat, plate-like crystals that are much thicker than they are wide.
11What is a 'crystal lattice'?A crystal lattice is a three-dimensional arrangement of atoms or molecules in a crystal, defining its internal structure.
12What is the significance of crystal morphology in materials science?Crystal morphology affects the mechanical, thermal, and electrical properties of materials, influencing their applications.
13Explain the term 'botryoidal' in crystal morphology.Botryoidal refers to a crystal habit that resembles a cluster of grapes, with rounded, bulbous shapes.
14What is a 'stalactitic' crystal formation?Stalactitic formations are elongated, icicle-like crystals that hang from ceilings in caves or mineral deposits.
15What is 'thermal gradient' and its effect on crystal growth?A thermal gradient is a difference in temperature that can influence the direction and rate of crystal growth.
16Define crystal habit.Crystal habit refers to the characteristic external shape or appearance of a crystal, which can vary widely among different minerals.
17Define 'crystal morphology analysis.'Crystal morphology analysis involves examining the shapes, sizes, and arrangements of crystals to understand their properties and formation.
18How do impurities affect crystal morphology?Impurities can disrupt the regular arrangement of atoms in a crystal, leading to changes in growth patterns and properties.
19What is a 'growth sector' in crystal morphology?A growth sector is a specific region of a crystal that grows at a different rate or under different conditions than other regions.
20Explain the term 'isomorphism' in crystallography.Isomorphism refers to the phenomenon where different substances can crystallize in the same crystal structure.
21What is the significance of crystal morphology in mineral identification?Crystal morphology provides key visual characteristics that help in the identification and classification of minerals.
22What is 'fibrous' crystal habit?Fibrous habit describes crystals that are composed of long, thin fibers, often resulting from specific growth conditions.
23What is the difference between 'habit' and 'form' in crystal morphology?'Habit' describes the general shape of a crystal, while 'form' refers to the specific geometric arrangement of its faces.
24What is the term for the study of crystal shapes and forms?The study of crystal shapes and forms is known as crystallography.
25What is the role of surface energy in crystal growth?Surface energy influences the stability of crystal faces and can affect the growth rate and morphology of crystals.
26What is a crystal's growth environment?A crystal's growth environment includes the conditions under which it forms, such as temperature, pressure, and the presence of solvents or gases.
27What is the difference between euhedral and anhedral crystals?Euhedral crystals have well-formed faces, while anhedral crystals lack distinct crystal faces and appear irregular.
28How do biological processes influence crystal morphology?Biological processes can lead to unique crystal morphologies, such as those found in biominerals, influenced by organic molecules.
29What is 'polymorphism' in the context of crystals?Polymorphism is the ability of a substance to crystallize into more than one distinct crystal structure.
30What is the significance of crystal defects?Crystal defects can influence the physical properties of a crystal, such as its strength, conductivity, and optical characteristics.
31Define 'prismatic' crystal habit.Prismatic habit refers to crystals that are elongated with flat, parallel faces, resembling a prism.
32How can crystal morphology indicate the conditions of formation?Different morphologies can suggest specific environmental conditions, such as temperature and pressure, during crystal growth.
33What is 'columnar' crystal habit?Columnar habit describes crystals that are elongated and cylindrical in shape.
34What is a 'crystal system'?A crystal system is a classification of crystals based on their symmetry and lattice parameters.
35What is a crystal face?A crystal face is a flat surface that forms part of the external boundary of a crystal.
36Describe the term 'faceting' in crystal morphology.Faceting refers to the development of flat surfaces on a crystal, which can enhance its aesthetic appearance and optical properties.
37Define 'twinned crystals.'Twinned crystals are formed when two or more crystals grow together in a symmetrical manner, sharing some lattice points.
38What is 'epitaxy' in crystal growth?Epitaxy is the growth of a crystalline layer on a substrate crystal, maintaining the orientation of the underlying crystal.
39Define 'morphological classification' in crystals.Morphological classification categorizes crystals based on their external shapes, habits, and forms.
40What is the role of nucleation in crystal growth?Nucleation is the initial process where small clusters of atoms or molecules form a stable nucleus, leading to crystal growth.
41What is crystal morphology?Crystal morphology is the study of the external shapes and forms of crystals, including their habits and structures.
42What role does supersaturation play in crystal formation?Supersaturation occurs when a solution contains more solute than it can normally hold, promoting crystal nucleation and growth.
43Define 'dendritic' crystal morphology.Dendritic morphology refers to tree-like or branching patterns in crystal growth, often seen in certain minerals.
44How does pressure affect crystal formation?Increased pressure can alter the stability of certain phases, leading to different crystal structures and morphologies.
45Explain the term 'spheroidal habit.'Spheroidal habit refers to crystals that have a rounded, ball-like shape, often resulting from uniform growth.
46How does temperature affect crystal growth?Higher temperatures can increase the solubility of materials, leading to faster growth rates, while lower temperatures may slow down or halt growth.