Question
The unwanted impurities such as mud, sand, etc., associated with ore.

Answer

Gangue

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$\begin{array}{cc}
\phantom{....}\ce{H}\phantom{..}\ce{H}\phantom{..}\ce{H}\\
\phantom{.......}|\phantom{...}|\phantom{...}|\phantom{....}\\
\ce{H-C-C=C}\\
\phantom{.......}|\phantom{...}\phantom{...}|\phantom{....}\\
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\end{array}$
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$\begin{array}{cc}
\phantom{...}\ce{H}\phantom{.......}\ce{}\phantom{..}\ce{}\\
\phantom{.......}|\phantom{.......}\phantom{...}\phantom{....}\\
\ce{H-C-C≡C-H}\\
\phantom{.......}|\phantom{.......}\phantom{...}\phantom{....}\\
\phantom{...}\ce{H}\phantom{.......}\ce{}\phantom{..}\ce{}\\
\end{array}$
_____________
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