# What are the 7 classes of crystals?

The seven classes of crystals are primitive cubic, body-centered cubic, face-centered cubic, rhombohedral, monoclinic, orthorhombic, and triclinic. These classes are determined by the shape and symmetry of the crystal unit cell, which is the repeated pattern of atoms or molecules that makes up a crystal.

The reason why there are only 32 crystal classes is due to the fact that there are only a limited number of ways in which atoms or molecules can be arranged in three-dimensional space to form a symmetric pattern that repeats throughout the crystal. These symmetries are based on mathematical principles and are known as point groups.

Here are the 7 classes of crystals in more detail:

• Primitive cubic: This class has one atom at each corner of the unit cell.

• Body-centered cubic: This class has one atom in the center of the unit cell and one atom at each corner.

• Face-centered cubic: This class has one atom at the center of each face of the unit cell and one atom at each corner.

• Rhombohedral: This class has a rhombic unit cell with three equal axes and angles that are not right angles.

• Monoclinic: This class has a unit cell with three unequal axes and two angles that are not right angles.

• Orthorhombic: This class has a unit cell with three unequal axes that intersect at right angles.

• Triclinic: This class has a unit cell with three unequal axes that intersect at angles other than 90 degrees.

Understanding the different classes of crystals can be helpful in determining the properties and potential uses of a particular crystal. Each class has unique characteristics that affect how it interacts with light, heat, and other environmental factors. Additionally, crystals of the same class may share similar metaphysical properties and therefore be used for similar purposes in spiritual practices.

## Introduction to Crystal Classes

Crystals have always been associated with spiritual and healing properties. They are commonly used in meditation, yoga practices, and alternative medicine. Crystals are known for their unique properties that make them useful to humans for a wide range of purposes. Each crystal has a specific class and shape, which affects its properties and applications. In this article, we will discuss the seven classes of crystals, their properties, and the role they play in spiritual healing.

## What are the Classes of Crystals?

Crystals are classified into seven different classes, based on their symmetry and geometrical shape. The seven classes of crystals are:

1. Cubic Crystals: These crystals have a perfect cube shape and possess four-fold symmetry. Examples of cubic crystals include diamond, fluorite, and halite.

2. Tetragonal Crystals: These crystals have a similar shape to cubic crystals but possess a four-fold symmetry. Examples of tetragonal crystals include zircon and staurolite.

3. Orthorhombic Crystals: These crystals possess a rectangular prism shape and have three-fold symmetry. Examples of orthorhombic crystals include topaz and sulfur.

4. Trigonal Crystals: These crystals possess an equilateral triangle shape and have three-fold symmetry. Examples of trigonal crystals include quartz and calcite.

5. Hexagonal Crystals: These crystals possess a hexagonal prism shape and have six-fold symmetry. Examples of hexagonal crystals include beryl and emerald.

6. Monoclinic Crystals: These crystals possess a trapezoid or parallelogram shape and have two-fold symmetry. Examples of monoclinic crystals include gypsum and azurite.

7. Triclinic Crystals: These crystals have a complex shape and lack any specific symmetry. Examples of triclinic crystals include labradorite and turquoise.

## Geometrical Symmetry & Crystal Classes

The shape and symmetry of a crystal play a significant role in its properties and applications. A crystal’s symmetry depends on its internal structure, which affects properties such as its refractive index, thermal conductivity, and electrical conductivity. The classification of crystals into different classes is based on their symmetry and geometrical shape.

Each crystal class has a unique set of properties that make it suitable for certain applications. For example, cubic crystals are commonly used in manufacturing lasers, while hexagonal crystals are used in the production of semiconductors.

## Why Only 32 Crystal Classes Exist?

The reason only 32 crystal classes exist is due to the possible combinations of symmetry and geometry in three-dimensional space. There are only a limited number of ways atoms can arrange themselves to produce these symmetries and shapes. Therefore, the number of possible crystal classes is limited to 32.

## Role of Crystal Classes in Spiritual Healing

The use of crystals for spiritual healing has been a common practice for centuries. Each crystal class has unique properties that make it useful for different spiritual purposes. For example, cubic crystals are believed to be protective, while hexagonal crystals are associated with mental clarity and focus.

The use of crystals for spiritual healing involves placing them on the body, meditating with them, or carrying them in a pouch. The belief is that different crystals possess different energies that can interact with the human energy field to restore balance, promote healing, and improve emotional wellbeing.

## Exploring the Properties of Different Crystal Classes

Each crystal class has unique properties that make it useful for specific applications. For example,

1. Cubic crystals are hard, durable, and resistant to scratches, making them ideal for use in jewelry and industrial processes.

2. Tetragonal crystals are prized for their optical properties, including their ability to produce double refraction.

3. Orthorhombic crystals possess excellent cleavage and are used in the production of gemstones.

4. Trigonal crystals are commonly used in the manufacturing of electronic devices due to their piezoelectric properties.

5. Hexagonal crystals possess excellent thermal conductivity and are used in the production of semiconductor devices.

6. Monoclinic crystals possess excellent cleavage and are used in the production of gemstones.

7. Triclinic crystals are used in the production of decorative objects and jewelry due to their unique shape and color.

## Crystal Classes in Jewelry Making

Crystals have always been a popular choice for jewelry making due to their beauty and unique properties. Different crystal classes are used for various jewelry pieces, depending on their properties and aesthetics. For example, cubic crystals such as diamond and garnet are commonly used in engagement rings, while hexagonal crystals such as emerald and aquamarine are popular choices for necklaces and pendants.

## Conclusion: Understanding the Significance of Crystal Classes

In conclusion, crystals have been used for spiritual and healing purposes for centuries. The classification of crystals into different classes based on their geometrical shape and symmetry is crucial in understanding their properties and applications. Each crystal class has unique properties that make it suitable for specific purposes. By understanding the significance of crystal classes, we can appreciate the beauty and benefits of crystals and their role in promoting wellbeing and spiritual balance.