Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Definitions for Silica Minerals.

Authors
Dunnom-DD
Source
Definitions for Asbestos and Other Health-Related Silcates 1984:188-192
Link
NIOSHTIC No.
00174558
Abstract
Definitions for silica minerals were presented, based on discussions held during a workshop on the subject. The definitions were designed to include sufficient description of the chemical and physical properties to distinguish a specimen from other species, to contain commonly available methods of property measurement, and to describe species with a likelihood of human exposure. Cristobalite (14464461), quartz (14808607), and tridymite (15468323) were described according to x-ray crystallographic data, and the interplanar spacing, relative intensity, source, and elemental analysis were presented. Diatomite was characterized as an x-ray amorphous silica mineral occurring as skeletons of diatoms visible by optical microscopy. Fumed silica (7631869), silica gel (7699414), and silica glass were also defined as amorphous solids, and the distinguishing characteristics of each were presented. Silica mineral was defined as a natural or synthetic crystalline or noncrystalline solid having a chemical composition of 90 percent or greater silicon-dioxide (7631869). Crystallinity, particle size, and x-ray diffraction were also defined. The author concludes that the silica minerals should be periodically redefined, and that future workshops should have access to more extensive information on biological mechanisms.
Keywords
Silica-dusts; Silicates; X-ray-analysis; Particulates; Silicon-compounds; Crystal-structure; Chemical-composition; Chemical-analysis; Dust-particles;
CAS No.
14464-46-1; 14808-60-7; 15468-32-3; 7631-86-9; 7699-41-4; 7631-86-9;
Publication Date
19840101
Editors
Levadie-B;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Source Name
Definitions for Asbestos and Other Health-Related Silcates
TOP