Matsyapurana 122.61

122.61

mandaraḥ saiva vijñeyaḥ sarvadhātumayaḥ śubhaḥ
manda ityeṣa yo dhātur apāmarthe prakāśakaḥ //

The sixth one is the Mahiṣa or the Hari. It is black like the clouds; and Mahiṣa Agni (volcano?) begotten from the water (rising from the sea?) lives there (in the form of fire). And the seventh one is the Kukudmânâ also known as the Mandâra. It is full of all kinds of minerals and precious stones, guarded by Indra Himself. The root ‘manda’ means water and since it scatters water, it is called Mandâra, in company of Brahma, for the good of the people. The internal dimensions of these mountains are double.—60-63.