Properties of Quartz

Quartz is an extremely strong and durable kitchen or bathroom countertop option.  We carry a huge in-stock selection of quartz in our stone slab showroom in Denver, Co.  Please visit us today or read more inforamation here.  Read more below about the Physical properties of Quartz and figure out if this stone is a good fit for your needs.

Physical Properties of Quartz

Hardness: Quartz has a Mohs Scale hardness rating of 7. That means quartz can scratch any mineral with a hardness rating below 7. However, quartz cannot scratch minerals with a higher hardness rating above 7 such as diamonds or corundum.  Shape: Quartz has a distinctive shape since they are always six- sided, elongate prisms with a pyramid-shaped end on on side. Cleavage: Quartz does not have “cleavage,” meaning it does not have a weakness in molecular geometry in which a mineral can break. Fracturing:  When quartz fractures, it breaks with dish-shaped, irregular surfaces. Fractured quartz faces are rough, uneven, and never flatColor and veining: Quartz has a range of  natural colors. Quartz crystals are considered semiprecious gems; they come in a variety of colors such as: yellows, lavender to purple, browns, and reds. The traces of other elements in the stone’s chemistry is responsible for the natural coloring of quartz crystals. However, there are artificial coloring processes that are used in the gem industry to dye fractured quartz crystals that are not typically seen in nature. These artificial colors include: bright pink and fluorescent shades of green, yellow, and blue. 

how to install quartz

Electrical Property of Quartz

Quartz has an unusual electrical property called,“piezoelectric,” that has no effect on the performance of the mineral in normal dimension stone applications.  If the mineral is squeezed, quartz generates an electrical current proportional to the amount of pressure applied. Therefore, when a small current is generated on two opposing faces of a cut, ground quartz crystal, it vibrates electrically. This vibration acts as an oscillator at a freqency determined by the exact thickness of the crystal. This process was used in communications as well. 

Physical Properties and Values of Quartz

Compressive Strength (C170) lbs/in² .............................2,000-37,000 Recommended (min): 4,000 (sandstone), 10,000 (quartzitic sandstone), 20,000 (quartzite) 
Flexural Strength (C880) lbs/in² ................................ 700-2,300Modulus of Elasticity*** (in millions) lbs/in² .................................. 1.0-1.75
Density, lb/ft3 (C97) ................135-170 Recommended (min): 125 (sandstone), 150 (quartzitic sandstone), 160 (quartzite) 
Modulus of Rupture (C99) lbs/in².300-2,500 Recommended (min): 350 (sandstone), 1,000 (quartzitic sandstone), 2,000 (quartzite) 

Absorption (by weight) % (C97) 1.0-20.0Recommended (max): 8.0 (sandstone), 3.0 (quartzitic sandstone), 1.0 (quartzite) 
Fire Resistance
Quartz stone is not combustible and is considered a fire-resistant material. It is not considered a highly rated thermal insulator. 
Abrasion Resistance 
Quartz- based stones are desirable and economically practical for floor and stairs due to their harness and uniform wearing qualities.

Quartz- based stone with an abrasive hardness of 8 or higher are recommended for the use of flooring that are subjected to normal foot traffic. For commercial floors, stair treads, and platforms that are subjected to heavy foot traffic, a minimum abrasive hardness of 12 is recommended.

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