ऊषरकर्बुरः पक्वलोष्ठवर्णो वा त्रपुधातुः ॥ कZ_०२.१२.१४ ॥
ūṣarakarburaḥ pakvaloṣṭhavarṇo vā trapudhātuḥ
锡矿/锡金属呈斑驳状,如盐碱地之色(ūṣara-karbura),或色如熟土块(pakva-loṣṭha)。
They translate technical mineral recognition into common visual references so non-specialist officials can apply them in the field.