'Glass' in the Bible

and before the throne is a sea of glass like to crystal, and in the midst of the throne, and round the throne, are four living creatures, full of eyes before and behind;

and I saw as a sea of glass mingled with fire, and those who do gain the victory over the beast, and his image, and his mark, and the number of his name, standing by the sea of the glass, having harps of God,

and the building of its wall was jasper, and the city is pure gold -- like to pure glass;

And the twelve gates are twelve pearls, each several one of the gates was of one pearl; and the broad-place of the city is pure gold -- as transparent glass.