Brazilian Chlorite Quartz Crystal

Polished Brazilian Chlorite Quartz crystal.
 
A 1st choice piece!
 
Video: https://www.youtube.com/watch?v=0gVOxI3QouA&ab_channel=RockMineralValley 
 
 
    Origin: Brazil
    Size: 5 cm by 4.5 cm by 3.5 cm for 110gr
    Chemical Formula: SiO2
    Crystal system: Trigonal
    Hardness Mohs' scale: 7
    Definition: Quartz, found throughout the world (Brazil, Uruguay, Africa, Mexico, Bulgaria, France...). Quartz is a mineral species of the silicatec group, a subgroup of the tectosilicate group, composed of silicon dioxide, or silica. It occurs either as large colorless, colored or smoky crystals, or as microscopic, translucent crystals.