German Jewellery.By Aamir Mannan. ANDALUSITE STONE
The brownish green andalusite showing a himt of red, which are rare enough to be sought-after by collectors, may show an absorption band in the blue at 4550 A, but it is not very enough reliable as a test. quite a different spectrum is seen in a rare green type of the
mineral from Brazil. Because of the extreme fineness and delicacy of the bands, this was formerly assumed to owe its absorption features to some unidentified rare earth. But this beautiful spectrum can now be ascribed to manganese, and was
reported as a feature of viridine a manganese rich form of andalusite. In this spectrum there is a sharp edge of shadow at 5255 A in the green, shading away on the yellow sidewhile on the other side is a narrow line at 5495 a.
mineral from Brazil. Because of the extreme fineness and delicacy of the bands, this was formerly assumed to owe its absorption features to some unidentified rare earth. But this beautiful spectrum can now be ascribed to manganese, and was
reported as a feature of viridine a manganese rich form of andalusite. In this spectrum there is a sharp edge of shadow at 5255 A in the green, shading away on the yellow sidewhile on the other side is a narrow line at 5495 a.
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