It is mostly occurs in pegmatites and constitutes an ore of tantalum.Microlite can also occurs as a primary mineral in lithium-bearing granite pegmatites, and in miarolitic cavities in granites.

• 它主要是出现在伟晶岩和tantalum矿.；微晶石也可作为锂矿伟晶花岗岩，花岗岩和在晶洞腔。