Describe the physical properties of minerals belonging to feldspar group giving suitable examples.

Feldspar is a significant mineral group within the field of mineralogy and plays a crucial role in crystallography and economic geology due to its abundance and diverse applications. Feldspar minerals are aluminosilicates, meaning they consist of aluminum, silicon, and oxygen, and they form an essential component of the Earth's crust. The feldspar group includes several distinct minerals, but the two most common varieties are orthoclase and plagioclase.

### Crystallography of Feldspar Group:

#### 1. Crystal System:
   Feldspar minerals belong to the triclinic or monoclinic crystal system. Orthoclase is monoclinic, while _____ __________ ______ ___ _______ __________ _____ ___ _________ ________ ____.
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