Technical data Technical data of Alta Quartzite Alta Quartzite is quarried in the mountains surrounding the Alta Fjord in Norway, in the northern region of the polar circle. It is a metamorphic, sedimentary laminated rock and the result of a natural process, started some 600 million years ago. During this period quartz grains became cemented together by silica and were transformed under enormous natural pressures into one of the hardest rocks on earth.
Amount of quartz (Si02):	~ ± 82%
Water-absorption acc. DIN 52103:	~ 0,15 weight-%
Compressive strength acc. DIN 52105:	~ 328N/mm²
Bending strength acc. DIN 52112:	~ 37 N/mm²
Wear by abrasion acc. DIN 52198:	~ 7,3 cm²
Non-slip properties acc. SRT:	~ 55 SRT
Non-slip properties acc. DIN 51097:	~ 31º, category C
Non-slip properties acc. DIN 51130:	~ R13
Thermal conductivity acc. ISO/DIS 8301:	~ 1,4 W/mK