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

The pyroxene group is one of the most important and widespread groups of silicate minerals, found commonly in igneous and metamorphic rocks. These minerals are characterized by their specific crystal structure and distinct physical properties, which are essential for identifying them and understanding their formation conditions. The pyroxene group includes minerals like augite, diopside, hedenbergite, and orthopyroxene, among others. Each of these minerals exhibits unique physical properties that are reflective of their chemical composition and crystalline structure.

1. Hardness:  
Pyroxenes generally exhibit moderate hardness, with a Mohs hardness of around 5 to 6. This means they can be scratched by harder materials like quartz but will not be scratched by softer minerals like feldspar. The hardness is primarily due to the strong covalent bonds between silicon and oxygen atoms in the _________ _______ _______ _____ ____ ______ _____ _________ ___ _____ ___ ____.
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