They were found among particles of gypsum, a soft mineral, in the desert.

它们是在沙漠中的石膏颗粒中发现的，石膏是一种软矿物。

It's also made with a nice hard mineral like quartz without too many softer minerals mixed in.

它也是用一种很好的硬矿物制成的， 比如石英，没有混入太多较软的矿物。