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जातेर्विशेषं सविधिं तस्य वक्ष्याम्यतः परम् ॥ ५५ ॥
हेमाद्याः सूर्य संतप्ताः स्रवन्ति गिरिधातवः । जत्वाभं मृदु मृत्स्नाच्छं यन्मलं तच्छिलाजतु ॥ ५६ ॥
मधुरम्ध सतिक्तश्च जपापुष्पनिभश्च यः । कटुर्विपाके शीतश्च स सुवर्णस्य निस्रवः ॥ ५७ ॥
रूप्यस्य कटुकः श्वेतः शीतः स्वादु विपच्यते । ताम्रस्य बर्हिकण्ठाभस्तिक्तोष्णः पच्यते कटु ॥ ५८ ॥
यस्तु गुग्गुलु काभासस्तिक्तको लवणान्वितः । कटुर्विपाके शीतश्च सर्वश्रेष्ठः स चायसः ॥ ५९ ॥
गोमूत्रगन्धयः सर्वे सर्वकर्मसु यौगिकाः । रसायनप्रयोगेषु पश्चिमस्तु विशिष्यते ॥ ६० ॥
यथाक्रमं वातपित्ते श्लेष्मापेत्ते कफे त्रिषु । विशेषतः प्रशस्यन्ते मला हेमादिधातुजाः ॥ ६१ ॥

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{"source": "Samhita : Charaka Samhita Part 2, Chapter :1, Sthanam :Chikitsasthanam, Shloka Number: 55 to 61", "explanation": "These verses (55-61) detail the unique properties of Shilajatu, categorized by its metallic origin.  Shilajatu is described as an exudate from metallic ores, softened and liquefied by the sun's heat.  The text emphasizes the substance's appearance, taste, post-digestive effect (Vipaka), potency (Virya), and therapeutic applications.\n\n**Formation of Shilajatu:**  The verses explain that Shilajatu is formed when mountain ores of metals like gold, silver, copper, and iron are heated by the sun. This heat causes a substance to exude from the ores, which resembles lac, is soft, smooth, and clear.\n\n**Types and Properties of Shilajatu:**  The properties of Shilajatu vary depending on the metal from which it originates:\n\n| Metal of Origin | Appearance        | Taste                | Vipaka    | Virya | Doshic Use        |\n|-----------------|--------------------|----------------------|-----------|-------|-------------------| \n| Gold           | Japa flower color | Sweet, slightly bitter | Pungent   | Cold  | Vata-Pitta        |\n| Silver          | White             | Pungent             | Sweet     | Cold  | Kapha-Pitta       |\n| Copper         | Peacock's neck    | Bitter, hot          | Pungent   | Hot   | Kapha            |\n| Iron           | Guggulu-like      | Bitter, slightly salty | Pungent   | Cold  | Tridosha (best for Rasayana) |\n\n**General Properties and Usage:** All types of Shilajatu have a cow-urine-like smell and are considered useful in various therapeutic applications.  However, iron-derived Shilajatu is particularly recommended for Rasayana (rejuvenation) therapies.\n\n**Doshic Applicability:**  The text specifies the doshic imbalances for which each type of Shilajatu is most suitable. Gold Shilajatu is indicated for Vata-Pitta imbalances, silver for Kapha-Pitta, copper for Kapha, and iron for all three doshas (Tridosha), making it the most versatile."}
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