Charak Samhita
यथाक्रमं वातपित्ते श्लेष्मपित्ते कफे त्रिषु। विशेषतः प्रशस्यन्ते मला हेमादिधातुजाः ॥६१॥
However, in the use of Rasayana, the last one is preferred, the above types of shilajatu are useful in vata-pitta, kapha-pitta, kapha and tridosha respectively.
english translation
yathAkramaM vAtapitte zleSmapitte kaphe triSu। vizeSataH prazasyante malA hemAdidhAtujAH ॥61॥
hk transliteration by Sanscript