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Questions and Answers
What is a crystal at a microscopic level characterized by?
What is the contributing part that will be repeated in a crystal called?
What causes different crystal formation shapes?
What affects the arrangement of the atoms, molecules, or ions, thus affecting the shape of the crystal?
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What are the Sodium (Na) atoms represented as in the crystal image of table salt?
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What color are the Chloride (Cl) atoms represented as in the crystal image of table salt?
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What is a crystal formed by combining?
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What is the macroscopic appearance of crystals referred to as?
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Which type of crystal has flat surfaces with sharp angles?
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What mineral is an example of a non-geometrical crystal with a prismatic habit?
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What affects the crystalline pattern and ultimately the crystalline shape?
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What characteristic is rare in minerals but can help identify them?
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Which mineral has a botryoidal habit?
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What is the term used to refer to the visible external shape of a sample of a material?
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What type of crystal shape is formed when snowflakes crystallize?
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Study Notes
Crystal Characteristics at Microscopic Level
- Crystals are characterized at a microscopic level by a highly ordered arrangement of atoms, molecules, or ions.
- The repeating unit in a crystal is called the "unit cell."
Crystal Formation and Arrangement
- Different shapes of crystals are caused by variations in the conditions under which they form, such as temperature and pressure.
- The arrangement of atoms, molecules, or ions is influenced by the conditions of formation, affecting the overall shape of the crystal.
Sodium and Chloride Atoms in Table Salt
- In the crystal image of table salt, Sodium (Na) atoms are typically represented as "small white spheres."
- Chloride (Cl) atoms are represented as "large green spheres" in the same crystal structure.
Crystal Formation and Appearance
- Crystals are formed by the combination of specific atoms or molecules that solidify in an ordered structure.
- The macroscopic appearance of crystals is referred to as "crystalline morphology."
Types of Crystals and Their Habits
- Ionic crystals have flat surfaces and sharp angles, contributing to their defined geometric shapes.
- Quartz is an example of a non-geometrical crystal that exhibits a prismatic habit.
Factors Affecting Crystalline Patterns
- The crystalline pattern and shape are affected by environmental conditions during formation, such as temperature variations and impurity levels.
- Unique characteristics, although rare, can help in mineral identification.
Unique Crystal Habits and Terms
- A mineral with a botryoidal habit is "hematite," which appears as grape-like clusters.
- The term for the visible external shape of a sample is "crystal habit."
- Snowflakes form a unique crystal shape characterized by intricate, symmetrical patterns.
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Description
Test your knowledge about crystals with this informative quiz! Learn about the structure and properties of crystals, including their highly ordered lattice arrangement and unit cells. Explore the fascinating world of crystallography and deepen your understanding of these beautiful and unique solid materials.
