From the perspective of color, how many categories does quartz have

Based on color, quartz can be classified into a wide range of categories. Here are some of the most common color classifications for quartz:

• Clear or colorless quartz
• White or milky quartz
• Purple or amethyst quartz
• Pink or rose quartz
• Yellow or citrine quartz
• Brown or smoky quartz
• Black or opaque quartz
• Red or iron oxide-coated quartz
• Green or chlorite-included quartz
• Blue or dumortierite-included quartz

These are just some of the most well-known color variations of quartz. In reality, quartz can come in almost any color imaginable, and some varieties can even change color depending on the lighting conditions.