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KAOLINITE
A hydrous aluminum silicate mineral

KERF
A slot into the edge of stone with saw blade for insertion of anchors

KEY BLOCK
In deepening a quarry, or starting to quarry downward from a horizontal surface, the first block removed from a new ledge, providing space and access for further block removal by undercutting, under drilling, or lateral shifting

KEYSTONE
The last wedge-shaped stone placed in the crown of an arch regarded as binding the whole

KILN
A furnace, oven, or heated enclosure used for burning or firing brick or clay material

KILN RUN
Brick from one kiln that have not yet been sorted or graded for size or color variation

KING CLOSURE
A brick cut diagonally to have one two-inch end and one full width end

KNEELER
Gabled cope stone which by its shape is also part of the wall, and may support other cope stones