Moonstone double tower

Double-point crystal towers, also known as twin crystals, are formed through a fascinating geological process. Here's a simplified explanation:

1. **Formation in a Magma Chamber or Cavity:**
- Initially, crystals form within a magma chamber or in a cavity within existing rocks. This can happen when molten rock (magma) cools and solidifies.

2. **Growth Under Specific Conditions:**
- As the crystal begins to grow, specific conditions like temperature, pressure, and mineral composition influence its structure. If the growth conditions are stable and symmetrical, a single crystal will form.

3. **Interruption in Growth:**
- However, if there is a sudden change in the environment during crystal growth, such as a shift in temperature or pressure, the crystal growth can be interrupted.

4. **Resumption of Growth:**
- When growth resumes, it may not occur uniformly. Instead, two separate points of growth may develop, resulting in a crystal with two distinct terminations or points.

5. **Symmetrical Growth:**
- If the growth conditions remain consistent after the interruption, the crystal will continue to grow in a symmetrical manner, creating a double-point or twin crystal structure.

The exact formation process can vary based on the type of mineral and the specific geological conditions. Twinning in crystals can occur in different ways, leading to various twin structures, including double points. The study of crystallography delves into these intricate formations and the conditions that influence them.