For a crystal system where a = b = c and alph | vedclass

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(D) The crystal system defined by the parameters $a = b = c$ and $\alpha = \beta = \gamma 
eq 90^\circ$ is known as the Rhombohedral (or Trigonal) sy

Vedclass · Accepted Answer

Rhombohedral system

Vedclass · Answer

(D) The crystal system defined by the parameters $a = b = c$ and $\alpha = \beta = \gamma 
eq 90^\circ$ is known as the Rhombohedral (or Trigonal) system.$1$. For a Cubic system: $a = b = c$ and $\alpha = \beta = \gamma = 90^\circ$.$2$. For a Tetragonal system: $a = b 
eq c$ and $\alpha = \beta = \gamma = 90^\circ$.$3$. For an Orthorhombic system: $a 
eq b 
eq c$ and $\alpha = \beta = \gamma = 90^\circ$.$4$. For a Rhombohedral system: $a = b = c$ and $\alpha = \beta = \gamma 
eq 90^\circ$.Therefore,the correct option is $D$.

For a crystal system where $a = b = c$ and $\alpha = \beta = \gamma \neq 90^\circ$,the system is:

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