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HAIRLINE CRACKING
Random pattern of superficial cracking in an exposed concrete surface. Usually surface openings of 20 mils or less

HALF BULLNOSE
A convex semicircular molding used on exposed edges or stone units such as countertops, stair treads, and window stools

HALF ROUND
An exposed edge or molding with a semi-circular section or radii

HALITE
Rock salt; sodium chloride; a sedimentary rock

HAND CUT RANDOM RECTANGULAR
A pattern where all the stone is hand cut into squares and rectangles; joints are fairly consistent. Similar to sawed-bed ashlar in appearance

HARD-BURNED
Nearly vitrified clay products that have been fired at high temperatures

HARDNESS
See Mohs Scale

HEAD
The end of a stone which has been tooled to match the face of the stone. Heads are used at outside corners, windows, door jams, or any place where the veneering will be visible from the side

HEAD JOINT
The vertical mortar joint between ends of masonry units. Also called a cross-joint or a vertical joint

HEADER
A masonry unit that overlaps two or more adjacent wythes of masonry to tie them together. Also called a bonder

HEADSTONE
A principle stone, as in keystone or cornerstone

HEARTH
That part of the floor of a room made of stone on which the fire is made or above is a stove, fireplace, furnace, etc.

HEMIHYDRATE
A hydrate which contains one-half of a molecule of water compared to one molecule of the principal element or compound forming the hydrate

HERRINGBONE
A pattern of setting in which the units are laid aslant, with the direction of incline reversing in alternate courses, forming a zigzag effect

HEWN STONE
To rough form by mallet and chisel

HIGH-STRENGTH ADHESIVE
A bonding agent of high ultimate strength used to join individual pieces of stone into pre-assembled units

HONE FINISH
A satin-smooth surface finish with little or no light reflection. Generally, a honed finish is preferred for floors or where traffic may wear off a high polish finish. It is also used on furniture tops and other surfaces. For the stones that cannot be polished, it is the only smooth finish possible

HONES/HONE FINISH
A very fine, satin smooth finish on stone. This is the last step before polishing. A super fine smooth finish with little or no gloss. Recommended for commercial floors

HORNEBLEND
A group of minerals including calcium, iron, magnesium, and aluminum silicates. May be present in igneous stones

HYDRATE
A mineral formed by the combination of water and some other elements or compounds

HYDRATED LIME
Quicklime to which sufficient water has been added to convert the oxides to hydroxides

HYDRAULIC
To harden under (or with) water

HYDROPHILIC
Substance which absorbs or has exhibited affinity for water

HYDROPHOBIC
Having no affinity for or is repellent to water. The quality of beading water on a substrate