Yellow fluorite 8 inches tall

The formation of yellow crystal towers, like any colored crystal, depends on the specific mineral responsible for the coloration. Here's a general overview:

1. **Mineral Composition:**
- The yellow color in crystal towers is often attributed to specific minerals present in the crystal. For instance, citrine, a variety of quartz, is a yellow to brownish-orange crystal that gets its color from traces of iron.

2. **Crystallization Process:**
- Yellow crystals typically form through a crystallization process in geological environments. This could occur in cavities within rocks, geodes, or in hydrothermal veins where mineral-rich solutions cool and solidify.

3. **Presence of Impurities:**
- The yellow color is often a result of impurities or trace elements present during the crystal's growth. In the case of citrine, the presence of iron imparts the yellow hue.

4. **Temperature and Pressure Conditions:**
- The specific conditions of temperature and pressure during the crystal's growth play a role in determining its size, shape, and color. Variations in these conditions can lead to different crystal structures and colors.

5. **Natural Radiation:**
- In some cases, natural radiation from surrounding rocks can influence the color of crystals. This is seen in minerals like yellow fluorite, where exposure to natural radiation can cause a yellow or golden coloration.

It's important to note that different yellow crystals may have distinct mineral compositions and formation processes. Understanding the geological context and the mineralogy of the crystal in question can provide more specific insights into its formation.