For the excavations of Dembeni (Swahili archaeology) and the Rock Crystal of Madagascar, please see the CNRS sub-programme of APIM
http://www.islam-medieval.cnrs.fr/comm_ocean_ind.php
OpenEdition suggests that you cite this post as follows:
Stéphane Pradines (October 28, 2013). Dembeni and Rock Crystal. Stephane Pradines. Retrieved February 15, 2025 from https://swahili.hypotheses.org/199