Eiswein is made from frosted grapes.

For Mr. Rosedale did Laura wear vestal white, when every one else was à la Zamiel, and a cottage bonnet—a cottage ornée, to be sure—when every other head was in a hat.

A more likely explanation is that ancient crystal skull carvers first chipped (cobbed) piecees off a block of material that was destined to be shaped into a skull.

[…] there are no words to describe the way she negotiated the abyss between her dreams, those wakings strange as her sleepings.