Ahmad ibn Yusuf al-Tīfāshī
Al-Tifashi, Ahmad Bin Yousef (683 CE) was a geologist. One of his books on geology include, “Flowering Ideas on Gemstones” (Azhar Al-Afkar fi Jawahir Al-Ahjar). Although it is more than 200 years after the work of Al-Biruni, it is of lower scientific value. However, it is much superior both in classifying minerals and in the method of studying them, which is very close to what we see now in modern mineralogy books.