In the same mines in which silver is found, there is also found a substance which, properly speaking, may be called a stone made of concrete froth.973 It is white and shining, without being transparent, and has the several names of stimmi, stibi, alabastrum,974 and larbasis. There are two kinds of it, the male and the female.975 The latter kind is the more approved of, the male976 stimmi being more uneven, rougher to the touch, less ponderous, not so radiant, and more gritty. The female kind, on the other hand, is bright and friable, and separates in laminæ, and not in globules.977