Question

The external expression of a mineral's orderly internal arrangement of atoms is referred to as:

a.its streak.
b.its specific gravity.
c.its hardness.
d.its luster.
e.its crystal form.

Answer 1

The external expression of a mineral's orderly internal arrangement of atoms is referred to as:

**e. its crystal form.**

Step-by-step explanation:

The external expression of a mineral's orderly internal arrangement of atoms is known as its crystal form. This concept is fundamental in mineralogy, which is the study of minerals and their properties. Minerals are naturally occurring inorganic substances with a specific chemical composition and a crystalline structure. The arrangement of atoms in a mineral's crystal lattice determines its external appearance, giving rise to various crystal forms.A crystal lattice is a three-dimensional arrangement of atoms, ions, or molecules in a repeating pattern that extends throughout the mineral. This internal structure influences the mineral's physical properties, including its crystal form.

Different minerals exhibit distinct crystal forms, and these forms can be classified into various crystal systems, such as cubic, tetragonal, orthorhombic, monoclinic, and triclinic, based on the symmetry of their crystal faces. For example, quartz commonly forms hexagonal prisms, while halite (salt) displays a cubic crystal form.Understanding crystal forms is essential for mineral identification, as they provide valuable information about a mineral's atomic structure and symmetry. Geologists and mineralogists use crystallography, a branch of science that studies crystals, to analyze and classify minerals based on their crystal forms.

Techniques such as X-ray crystallography help determine the precise arrangement of atoms within a crystal lattice.In summary, the external expression of a mineral's internal arrangement of atoms is its crystal form. This concept is crucial for mineralogists and geologists, aiding in the identification and classification of minerals based on their unique and characteristic crystal structures.

Answer 2

The external expression of a mineral's orderly internal arrangement of atoms is its crystal form, which is characterized by its geometric shapes and structure. Thus (option e) is right answer.

Step-by-step explanation:

The external expression of a mineral's orderly internal arrangement of atoms is known as (option e) its crystal form.

A mineral's crystal form is the outward manifestation of the orderly internal arrangement of atoms within its structure, which can be observed by the shape and structure of the mineral itself. Minerals can exhibit crystal faces, edges, and angles that are consistent with their internal atomic structure, resulting in the distinctive, geometric shapes that are characteristic of crystalline materials.