AGATE MORTAR & PESTLE
TECHNICAL SPECIFICATIONS :
Chemical composition: 99.9% Si02, which makes it a quartz species, with trace contaminants alumina and iron oxide common
Class: Tectosilicate
Crystal system: Hexagonal-R; 32 (trigonal-trapezohedral)
Crystal habit: Usually as banded or layered botryoidal masses with microfibrous structure
Zoning: Colour banding and layers of inclusions are common
Specific gravity: 2.57 - 2.64
Mohs hardness: 6.5 - 7
Index of refraction: 1.53 - 1.55
Birefringence: Weak, 0.005 to 0.009
