Agent Name

Allophane

CAS Number

12172-71-3

Formula

Unspecified

Major Category

Mineral Dusts

Synonyms

Allophosite; [Sigma-Aldrich MSDS]

Category

Other Mineral Dusts

Description

Solid; [Sigma-Aldrich MSDS]

Sources/Uses

"Allophane is an amorphous to poorly crystalline hydrous aluminium silicate clay mineraloid. Its chemical formula is Al2O3(SiO2)1.3-2(2.5-3)H2O. Since it has short-range atomic order, it is a mineraloid, rather than a mineral, and can be identified by its distinctive infrared spectrum and its X-ray diffraction pattern. It was first described in 1816 in Grenthal, Thuringia, Germany. Allophane is a weathering or hydrothermal alteration product of volcanic glass and feldspars and sometimes has a composition similar to kaolinite but generally has a molar ratio of Al:Si = 2." [Wikipedia]

Comments

An eye and respiratory tract irritant; Harmful by inhalation; Targets the lungs; Exposure may have neurotoxic effects; [Sigma-Aldrich MSDS] See "Kaolin."

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