Charak Samhita
ततोमत्स्यण्डिकाखण्डशर्कराविमलाःपरम्। यथायथैषांवैमल्यंभवेच्छैत्यंतथातथा ॥२४०॥
Further purification turns it into matsyandika/ curd sugar. Sugar-candy/khanda and crystal-sugar/sharkara are considered extremely pure. According to its degree of purity its cooling quality is increased.
english translation
tatomatsyaNDikAkhaNDazarkarAvimalAHparam। yathAyathaiSAMvaimalyaMbhavecchaityaMtathAtathA ॥240॥
hk transliteration by Sanscript