[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Minerals and Metals in Ancient India](https://indike.org/pramana/ins.science.biswas-1996) › v2.c45.s3.2 # Minerals and Metals in Ancient India v2.c45.s3.2 Minerals and Metals in Ancient India v2.c45.s3.2 - **Language:** English ### [v2.c45.s3.2](https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3.2) Abhraka, tentatively translated as mica, was defined as a class of material which binds mercury, and therefore these materials were probably sulphur-bearing mica-like substances. Abhrakas were classified in \*RRS\* under four categories depending upon their colours and behaviours when put on fire. - [Previous: v2.c45.s3.1](https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3.1) - [Next: v2.c45.s3.3](https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3.3) - [Up: v2.c45.s3](https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3) ## Cites (1) - [Rasaratnasamuccaya](https://indike.org/pramana/in.med.rasa.samuccaya.pramukha.rasaratnasamuccaya) — Vāgbhaṭa (alchemist), Sanskrit --- Source: [https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3.2](https://indike.org/pramana/ins.science.biswas-1996.v2.c45.s3.2) · Pramāṇa