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Beneath tents and canopies, on block after block, rested every kind of stone imaginable: the opaque, soapy pastels of angeline; dark, mossy-toned epidote; tourmaline streaked with red and green.

“That’s the iron silicate minerals epidote and chlorite. Those two green minerals are part of the bull’s eye.”

It is usually black in color, opaque, and is related to epidote in form and composition.

The purer beds recrystallize as marbles, but where there has been originally an admixture of sand or clay lime-bearing silicates are formed, such as diopside, epidote, garnet, sphene, vesuvianite, scapolite; with these phlogopite, various felspars, pyrites, quartz and actinolite often occur.

Zoisite, zoi′sīt, n. a mineral closely allied to epidote.