Quartz (Engineered Stone Countertop)

Physical Properties

Hardness: 7 (Mohs); Color: White with grey and translucent speckles; Luster: Vitreous to dull; Crystal structure: Trigonal (quartz grains); Specific gravity: ~2.65

Formation & Geological History

Formed through industrial pressure and heat (vibro-compression) combining roughly 90-94% crushed natural quartz with 6-10% polyester resin and pigments. The quartz itself is a common igneous and metamorphic mineral.

Uses & Applications

Primary use is for residential and commercial countertops, flooring, and wall cladding due to its non-porous and scratch-resistant nature.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Engineered quartz surfaces were first developed by the Italian company Breton S.p.A. in the 1960s.

Field Identification & Locations

Identify by the uniform pattern and lack of natural veining compared to marble or granite. It is found in home improvement stores and modern kitchens globally. Collectors don't typically seek engineered grain, only natural quartz crystals.

Identified on: 4/26/2026

Mode: Standard