Crystal Basics: A Beginner’s Guide to Quartz Crystals

Welcome to our crystal series. In this article, we will primarily explore how crystals form. By the end of this article, you will build a solid foundation of crystal knowledge.

A crystal is crystalline quartz, and its primary chemical component is silicon dioxide. When silicon dioxide crystallizes perfectly, it forms what we know as a crystal. Pure quartz crystal is colorless and transparent, commonly known as clear quartz. When trace elements get trapped inside during formation, crystals develop different colors. Take amethyst, for example; its purple hue comes from the iron and manganese within its crystal structure.

Crystals register at 7 on the Mohs hardness scale. They are hard yet brittle, so avoid impacts and knocks while wearing crystal jewelry. Crystals also have a distinctive physical property known as piezoelectricity. When pressure is applied to a crystal, it generates an electric field. Conversely, when electric current passes through it, the crystal vibrates at high frequency. This physical phenomenon is the scientific basis behind the popular idea of crystal energy fields.

Natural crystals form under extremely strict geological conditions. The surrounding pressure reaches two to three times standard atmospheric pressure, and the temperature stays roughly between 550°C and 600°C. Crystals grow slowly over millions of years and finally develop their characteristic hexagonal prism shape.

Now let’s talk about crystal classification. Based on color, official gemstone standards define six main varieties: clear quartz, amethyst, citrine, green quartz, red quartz, and rose quartz.

We can also sort crystals by their internal inclusions. Rutilated quartz contains visible needle‑like or fibrous inclusions that look like fine hair. Subcategories include golden rutilated quartz, green rutilated quartz, and copper rutilated quartz. Phantom quartz contains dense speckled mineral inclusions, with popular formations such as treasure bowl, pyramid, and layered phantom. Other inclusion varieties include rabbit hair quartz, floral quartz, and water bubble quartz. We will dive deep into these types in future articles.