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Gem and Ornamental

Gem and Ornamental

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202 G W AND ORMAMENTAL MA-OF ORGANIC ORIGINFigure 11.11 White isid 4, 'bmbo cord', rough, showing calciumcarbonate sections interspersed with gorgonin.on the her branch tips, where they give an abrasive surface to theunpo1ithe.d coral. On close impemion some of the pines appear almosttr<strong>and</strong>ucent. The thicker sterng may appear completely ke of sgines,which is one of the reasons that they are f i d t to identify <strong>and</strong> maybe confused with corals of other orders.Some of the antipahrims have a Mce that, when viewed undermagdication, appem dightly bubbly (Fii. 11.15). This surbce m yremain when the d is worked. Snkhqdm <strong>and</strong> Cirrm arecmmples of this. They we sometima called 'wire cds' rn they growin s coiled unbranched form, which can easily be cut <strong>and</strong> made intocircular bangles by joining the two end^. hbp& is motherantipahrim, but it has a r~~turdly high lustre, even before polishing.It often shows growth rings in a paler colour (Fii 11.14 <strong>and</strong> 11.16).It is well Imown mound the Mediterranean,

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