The marble is commonly of a pale yellow color, but occasionally it is streaked with red, green, or copper-colored veins.
In metals the country is thought to be rich, but no satisfactory examination of it has been as yet made.

Iron, copper, and native steel are derived from mines actually at work; while Europeans have observed indications of lead, arsenic, and antimony in Azerbijan, in Kurdistan, and in the rocky ridges which intersect the desert.

Tradition speaks of a time when gold and silver were procured from mountains near Takht-i-Suleman, and it is not unlikely that they may exist both there and in the Zagros range.

Quartz, the well-known matrix of the precious metal, abounds in Kurdistan.
Of all the mineral products, none is more abundant than salt.

On the side of the desert, and again near Tabriz at the mouth of the Aji Su, are vast plains which glisten with the substance, and yield it readily to all who care to gather it up.