Rock or "Mountain" crystal is the colorless variety of quartz and can be found all over the world Some crystal can weigh tons, but polishable quality is rather rare. The name "crystal" Is actually derived from the Greek "crystallos" It means "Ice", In those days rock crystal was believed to be eternally frozen water. Rock crystal is often used as imitation for diamond. Shree Yantra helps in breaking all the Obstacles in our life. It helps us push indefinitely and easily the limits of growth.

• Refractive index: 1.544-1.553
• Birefringence: 0.009
• Specific gravity: 2.65/ ±0.02-0.03
• Crystal system: Trigonal
• Hardness: 7
• Inclusions- Polariscope bull's eye