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Which of the following is correct
Crystal system Axial distance
P
Axial angles
Examples
1V
Cubic \( \quad a \neq b=c \)
\( \alpha=\beta \neq \gamma=90^{\circ} \quad \quad C u, K C l \)
Monoclinic \( \quad a \neq b-c \)
\( \alpha=\beta=\gamma=90^{\circ} \quad \quad \mathrm{PbCrO}, \mathrm{PbCrO}_{4} \)
Rhombohedral \( \quad a=b-c \)
\( \alpha-\beta=\gamma \neq 90^{\circ} \quad \quad \quad \mathrm{CaCO}, \operatorname{HgS} \)
Triclinic
\( a=b=c \)
\( \alpha \neq \beta-\gamma \neq 90^{\circ} \)
\( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{CuSO}, 5 \mathrm{H}_{2} \mathrm{O} \)
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