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  • Title: Sol-gel synthesis of nano-scale, end-member albite feldspar (NaAlSi3O8).
    Author: Anovitz LM, Affolter A, Cheshire MC, Rondinone AJ, Allard LF.
    Journal: J Colloid Interface Sci; 2021 Dec; 603():459-467. PubMed ID: 34214722.
    Abstract:
    Feldspars are the most abundant minerals in the Earth's crust, and are also important constituents of many lunar rocks and some stony meteorites. Albite (NaAlSi3O8) makes up the sodium corner of the feldspar ternary diagram (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8) and connects the alkali-feldspar and plagioclase binary joins. Synthesis of albite, however, has long been a problem, even at high temperatures and even at high pressures when dry. In fact, most successful syntheses require the combination of high-pressure, high-temperature, and hydrothermal environments. This paper presents a sol-gel method of albite synthesis that requires hydrothermal processing followed by high-temperature recrystallization, but no high-pressure environments. This has the advantage of allowing synthesis of relatively large amounts of material and controlled elemental substitutions.
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