Recent studies of ancient bat guano deposits in the caves of Gunung Mulu National Park and Niah National Park, Sarawak, Malaysia, have resulted in noteworthy records of phosphate minerals from these environments, including variscite, nano-particulate silica, fluorapatite, and niter.

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Keywords Fluorapatite, Gunung Mulu, Niah, Niter, Variscite
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Journal International Journal of Speleology
McFarlane, D.A. (Donald A.), & Lundberg, J. (2018). New records of guano-associated minerals from caves in northwestern Borneo. International Journal of Speleology, 47(2), 119–126. doi:10.5038/1827-806X.47.2.2169