Anandakanda 2.8.24

2.8.24

vidrumākhyā suraktā sā durlabhā dīptarūpiṇī /
<coral:: parīkṣā:: good quality>
pāṣāṇatvaṃ bhajatyeṣā pākataḥ kaṭhinā satī //

named vidruma, is bright red, rare, and radiant in appearance.
Becoming hard by maturation, it attains stoniness.