Given the task definition and input, reply with output. You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

# A form of granite, but having the component materials, especially the mica, arranged in planes so that it breaks rather easily into coarse slabs or flags.\nhttp://www.zulumoon.com/glossary/G-glossary.htm\n\n# a laminated metamorphic rock similar to granite\nhttp://wordnet.princeton.edu/perl/webwn\n\n# Gneiss is a common and widely distributed type of rock formed by high grade regional metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks. Gneissic rocks are coarsely laminated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc. ...\nhttp://en.wikipedia.org/wiki/Gneiss

what is gneiss?