Quartzites are metamorphic rocks with a saccharoid texture derived from sandy sediments, formed essentially by recrystallized quartz grains and cemented or not by siliceous material.
Ground Rock Quartz with 98.66% Sio2
Standardized tests of samples of Quartzite São Tomé, provided the following results:
Water Absorption (DIN 52 103)¹...............................................0,66%
Gross Density (DIN 52 102)¹.................................................2,605 Kg / dm³
Attrition (ISO DIS 10.545 / 1.500 ciclos).................................Classe 3
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