The pegmatite fields of San Luis have an important past record of producing mica, beryl, spodumene, tantalite (tantalum oxide), columbite (niobium oxide), and recently potassium feldspar, albite
A similar stone known as youguo, from Sanbaopeng (near Jingdezhen) is a high albite
material (soda mica), and is more fusible and only moderately plastic.
The study by FARIA (2008) demonstrated that the crystal grains are richer in Na at their periphery and richer in Ca at the core, so the composition of the borders is albite
(the sodic plagioclase), and the core is anorthite (the calcic plagioclase).
The rhyolite sheets are sparsely porphyritic, at places banded, and composed of perthite, quartz, albite
, sodic amphibole, aegirine-augite, opaque oxide and titanite.
ii) transferring stable silicon-rich components, such as kaolinite and quartz, to easily soluble compounds, for example, albite
and nephelite: in order to improve the Si[O.
Besides, the Calama sample had peaks attributed to aluminum silicates such as albite
the country rock) in close proximity to the intrusions has been fenitized to varying degrees, producing quartz syenite, alkali syenite, nepheline syenite, pyroxene nephelinite, microcline syenite and albite
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and dolomite were not incorporated to prepare samples for the TGA and DSC experiments because the decomposition temperatures of these three minerals are out of our scan range.
In a microscopic study of the sample ZMT--375 that is removed from this zone plagioclases of the rock became sosority and changed to the set of epidote and albite
The most abundant were quartz, calcite with 25 to 30% each, albite
Partly greisenized topaz-albite
granite is a medium grained, equigranular rock consisting of quartz, albite
(Ano_2), potassium feldspar, lithium mica and topaz.