The inner face .of the arches, with the spandrils and the pilasters which support them, are covered with flowers and foliage of delicate design and dainty execution, crusted in green serpentine, blue lapis lazuli and red and purple porphyry.
The Arabian geographers of the 10th century speak of its mines of ruby and lapis lazuli, and give notices of the flourishing commerce and large towns of Waksh and Khotl, regions which appear to have in part corresponded with Badakshan.
Acting upon that theory, the experts of TokyO and Nagoya have produced many very beautiful specimens of monochrome enamelyellow (canary or straw), rose du Barry, liquid-dawn, red, aubergine purple, green (grass or leaf), dove-grey and lapis lazuli bl,ue.
The mineral was probably included with selenite under Pliny's term lapis specularis.
In 1828 he was awarded the prize offered by the Societe d'Encouragement pour l'Industrie Nationale for a process of making artificial ultramarine with all the properties of the substance prepared from lapis lazuli; and six years later he resigned his official position in order to devote himself to the commercial production of that material, a factory for which he established at Fleurieux sur Saone.
The composition of the pigment is quite similar to that of lapis lazuli; but the constitution of both is uncertain.
The lapis specularis of Pliny, scattered over the Circus Maximus to produce a shining whiteness, was probably mica.
In 1717 Louis Lemery exhibited to the Paris Academy of Sciences a stone from Ceylon which attracted light bodies; and Linnaeus in mentioning his experiments gives the stone the name of lapis electricus.
In any large collection of fragments it would be easy to find eight or ten varieties of opaque blue, ranging from lapis lazuli to turquoise or to lavender and six or seven of opaque green.
Gold and lapis lazuli are found in other parts of the island.