Here are a few options for a WordPress post_tag description in Traditional Chinese for the title “水晶種類,” with slightly different nuances:

**Option 1: Simple and Direct**

* **Description:** 了解各種不同類型的水晶，包括它們的形成、特性和用途。 (Understand different types of crystals, including their formation, characteristics, and uses.)

**Option 2: Emphasizing Variety**

* **Description:** 探索多種多樣的水晶世界，從常見到罕見，揭開每種水晶的奧秘。(Explore the diverse world of crystals, from common to rare, uncovering the mysteries of each one.)

**Option 3: Focusing on Knowledge acquisition**

* **Description:** 深入了解不同水晶的分類和特性，豐富您對水晶知識的理解。(Delve into the classification and characteristics of different crystals, enriching your understanding of crystal knowledge.)

**Option 4: More Engaging and Benefit-Oriented**

* **Description:** 想知道不同水晶的功效嗎？在這裡找到各種水晶的資訊，幫助您選擇最适合您的。(Want to know the effects of different crystals? Find information about various crystals here, helping you choose the ones that are right for you.)

**Which to Choose?**

The best option depends on the overall focus of your website and the purpose of these tags. Consider the following:

* **Beginner-friendly?** Option 1 or 4 might be best.
* **Detailed/Technical content?** Option 2 or 3 might be more suitable.
* **Selling crystals?** Option 4 might be good, highlighting benefits to users.
* **General knowledge sharing?** Any option would work, depending on your tone/style.

Remember to be consistent with the tone and style of your blog when choosing the option. Good luck!