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NBGQA
Definition:

The abbreviation for the National Building Granite Quarries Association, a trade association whose membership is composed of granite producers in the United States. Collectively, these companies provide a major portion of the domestically quarried architectural granite produced in the U.S. 


NIOSH
Definition:

The National Institute for Occupational Safety and Health.


NTCA
Definition:

(National Tile Contractors Association) A trade association whose active membership consists of ceramic and stone tile installation contractors in the United States, with an associate membership of those who supply products and services to the industry. Founded in 1947.


Natural Bed
Definition:

The horizontal stratification of stone as it was formed in the deposit.


Natural Cleft
Definition:

Stone that is split (cleaved) parallel to its stratification, yielding a surface that is irregular to a degree that corresponds with the flatness of the material’s layering.


Natural Stone
Definition:

A product of nature. A stone such as granite, marble, limestone, slate, travertine, or sandstone that is formed by nature, and is not artificial or manmade.


Neat Cement
Definition:

A fluid mixture of portland cement and water, with or without other ingredients; also the hardened equivalent of such mixture. Commonly used in a thick, creamy consistency to parge the stone surfaces and strengthen the bond between a stone and a setting bed. Also called “cement butter,” “cement paste” and “cement cream.” See also back parging and parge.


Niche
Definition:

A recess in an interior or exterior wall usually for a statue or an urn, often semicircular in design.


Nonstaining Mortar
Definition:

Mortar composed of materials which individually or collectively do not contain material that will stain the adjacent materials to which it comes in contact.


Notch
Definition:

A V-shaped cut made on the edge or head of a stone.