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Properties used to identify asbestos by PLM Asbestos type Chrysotile Amosite Anthophyllite Tremolite Actinolite Crocidolite RI liquid 1.550 1.670 .1605 1.605 1.640 1.700 Property Morphology Fibrous Fibrous Fibrous Fibrous Fibrous Fibrous Fibrous Pleochroism Fibre parallel None None None None Green Blue Fibre perpendicular None None None None Grey Grey Birefringence Low Moderate Moderate Moderate Moderate Low/anomalous Extinction Complete, or undulose with curved fibres; parallel Complete; parallel Complete; parallel Complete; parallel or small angle Complete; parallel or small angle Complete; parallel Sign of Usually positive (length slow) Positive (length slow) Positive (length slow) Positive (length slow) Positive (length slow) Usually negative (length fast) Purple Yellow Yellow- Yellow Yellow-brown Blue Blue Purple-red Blue-red Blue Blue-purple Blue Pale-blue Orange Grey Yellow Dark-grey Orange Dark-grey Yellow Dark-grey Yellow Blue Red-brown Pale-blue Orange Blue Orange Blue Orange-yellow Blue Orange Blue Orange Blue Red-brown n 1.537-1.554* 1.6700-1.675* 1.59601.654+ 1.599-1.620+ 1.619-1.658+ 1.680-1692* n 1.6830-1.694* 1.683-1.694* 1.625-1.667+ 1.622-1.641+ 1.641-1.677+ 1.683-1.700* elongation Dispersion Staining Objective Colours Phase Contrast Objective Colours Refractive Index Ranges Fibre parallel Fibre perpendicular Fibre parallel fibre colour halo colour Fibre perpendicular fibre colour halo colour Tersus GPD 3: laboratory procedure document, Issue 8, March 12 orange 13 of 19
