Allophane

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 Gräfenthal, 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."
Biomedical References

Diseases, Processes, and Activities Linked to This Agent

Other Information
No other related information on this agent was found.