Economic Mineralogy a Practical Guide to the Study of Useful Minerals

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Hardness, about 4. Specific gravity, about 3-2.
Optical Colour blue. Lustre, silky. Refractive index and bire- fringence near those of tremolite ; 7 - a = 0-025. Optical sign positive. Compensate with quartz wedge along the length of the fibres. Ex- tinction oblique, the maximum angle being about 20. Slightly pleo- chroic.
Chemical and blowpipe. - Silicate of iron and sodium (Na 2 . Fe 2 3 . 2FeO . 6Si0 2 ).
Fusibility, 3J, fusing readily to a black magnetic globule. Strong yellow flame colorat
...ion due to sodium. Not decomposed by ordinary acids.
Occurrence and distribution. Crocidolite is found in Griqualand West, South Africa, where it has been mined successfully at various places in Prieska and Hay. The Griqua Town beds in which it occurs are of uncertain age, but they are very old and are either early Palaeozoic or pre-Cambrian. The crocidolite occurs in the form of thin veins (fig. 208) in a green slaty rock, forming layers that are interbedded with hard banded jaspers and ironstones.


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