Kyanite is an aluminum silicate mineral, with the chemical formula Al2SiO5. It is typically patchy blue in color, though it can range from pale to deep blue [6] and can also be gray or white or, infrequently, light green. [7] .

Aluminum silicate (or aluminium silicate) is a name commonly applied to chemical compounds which are derived from aluminium oxide, Al 2 O 3 and silicon dioxide, SiO 2 which may be anhydrous or hydrated, naturally occurring as minerals or synthetic. Their chemical formulae are often expressed as xAl 2 O 3 ·ySiO 2 ·zH 2 O.

2023年10月25日 · Kyanite is a mineral composed of aluminum silicate, and it belongs to the family of aluminosilicate minerals. Its chemical formula is Al2SiO5. Kyanite typically forms bladed crystals, and its name is derived from the Greek word “kuanos,” meaning blue, which reflects its most common blue coloration.

Kyanite, andalusite, and sillimanite are naturally occurring anhydrous aluminum silicate minerals. Each has the same chemical formula, Al 2 SiO 5, but differing crystal structures, making them mineral polymorphs.

2014年1月10日 · Aluminum silicate (Al2SiO5) is also known as kaolin, or hydrated aluminum silicate when in powder form. Aluminum silicate is a mixture of alumina, silica, and oxygen. Kaolin is often used as a demulcent and adsorbent in pharmaceutical industry. It is used in color lakes (insoluble dyes).

2023年8月25日 · Definition: Andalusite is a naturally occurring aluminum silicate mineral with the chemical formula Al2SiO5. It crystallizes in the orthorhombic crystal system, forming prismatic crystals that often display a distinctive cross-shaped pattern when viewed in cross-section.

Metamorphosed peri-aluminous sedimentary rocks. Common world wide. Link to MinDat.org Location Data. From the Greek kyanos = "blue." Comments: Two terminated, bright blue crystals of kyanite in a white quartz matrix. Location: Barra do Salinas, Minas Gerais, Brazil. Scale: 9.5 x …

This is a book exclusively devoted to three minerals: the Al 2 SiO 5 polymorphs - andalusite, sillimanite, and kyanite. This may seem to be narrowly focused and esoteric. However, as discussed in Chapter 1, the aluminum silicate polymorphs are perhaps the most important mineral group to metamorphic petrologists.