Red Zircon Necklace Jewellery.
these both owe their colour to manganese and have similar spectra.Normally only a broad band in the green centred near 5500A can be seen.Transparent specimens of rhodochrosite,which are very rare,show a band in the violet at 4490A and an intense band at 4I00A in the deep violet.Transparent rhodonite shows a narrow band at 5030A,a
By Aamir Mannan.
RED STONES RED ZIRCON
Through some red zircons show the distinctive narrow band in the red at 6535A,its fainter companion at 6590A,and some ten other narrow bands distributed throughout the spectrum,due to uranium,there are some (notably those from Expailly)which show no bands at all.The drawing given shows the full spectrum.Wavelengths of these bands will be given in the description of the yellow zircon spectrum,which is more constand and reliable.
Of the other red or pink stones found in jewellery which
show absorption bands one may briefly mention red pastes owing their colour to selenium,which have only a board band in the green which varies in position according to the type of glass used,and the two translucent ornamental pink stones,
rhodonite and rhodochrosite.
these both owe their colour to manganese and have similar spectra.Normally only a broad band in the green centred near 5500A can be seen.Transparent specimens of rhodochrosite,which are very rare,show a band in the violet at 4490A and an intense band at 4I00A in the deep violet.Transparent rhodonite shows a narrow band at 5030A,a
vague band at 4550A, and very strong narrow bands at 4I20 and4080A.These
spectra have little practial value,but are insteresting in their relation to the spectrum of spessartite,the manganese garnet,the spectrum of which will be found under 'yellow stones'.
spectra have little practial value,but are insteresting in their relation to the spectrum of spessartite,the manganese garnet,the spectrum of which will be found under 'yellow stones'.
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