Spectacular group of warwickite crystals, on a jumillite matrix, jumillite is a variety of lamproite, an ultrabasic rock only found in a few locations in the world, this volcano was exploited for the use of phosphates due to the abundance of fluorapatite, but when the large phosphate deposits of the Spanish Sahara began to be exploited in the middle of the last century, this exploitation was abandoned. Some prospecting was also done to see the viability of obtaining diamonds, which was immediately discarded. Spanish collectors intensely sought fluorapatites for their beauty, here they were locally called asparaguines for their greenish-yellow color, but there were also borates such as Warwickite that were among the best in the world, and it is also one of the completely stable borates.
Today these mines are protected and are a protected national site, both due to the special characteristics of the site and the existence in the mines of a population of native bats that are currently protected fauna in danger of extinction. then entry to the site is completely prohibited.

Other minerals are also present in the sample, such as specularite hematite, leucite, pseudobrookite, Fluorapatite, fluoro-richterite, Calcite, etc.