Lithium is present as spodumene or lepidolite within pegmatite. Spodumene or mica crystals can be precipitated. Arfwedson later showed that this same element was present in the minerals spodumene and lepidolite. For example, the LiO content of the principal lithium mineral spodumene (LiAlSiO) is 8.03%. Tenebrescent minerals include hackmanite, spodumene and tugtupite. It occurs as a secondary alteration product of spodumene. Over time, the mine would produce quantities of quartz, feldspar, mica, beryl, spodumene and columbite. It is usually associated with lepidolite, beryl, quartz, albite, amblygonite, and spodumene of pegmatitic origin. It is associated with other lithium-bearing minerals like spodumene in pegmatite bodies. It is commonly associated with topaz, cassiterite, wolframite, lepidolite, spodumene, beryl, tourmaline, and fluorite. Occurs in lithium-bearing pegmatites with spodumene, lepidolite, and tourmaline. Pegmatites are the primary source of lithium either as spodumene, lithiophyllite or usually from lepidolite. These include spodumene, microcline, beryl, and tourmaline. Amblygonite occurs with spodumene, apatite, lepidolite, tourmaline, and other lithium-bearing minerals in pegmatite veins. Lithium is extracted from spodumene by fusing in acid.