1 Paint-there are dozens of quality brands available, and for a room in the size described it will require two full gallons to cover the walls. 2  The better paints will cost between $30 and $50 per gallon, and will come as flat, semi-gloss, or glossy finish.
Foliation is the result of the parallel arrangement of (micas, etc.) in a plane perpendicular to the maximum principal applied stress. A lineation is caused by a similar growth of elongate minerals (eg. hornblende) in this plane. Slate, schist, and gneiss are three common foliated metamorphic rocks.
Below are descriptions of the most common metamorphic rocks with their protoliths. Slate is a fine-grained gray, green, or bluish metamorphic rock easily split into smooth, flat plates along cleavage planes. Slate is used for roof shingles and black boards. Slate displays slaty rock cleavage (see below).