Loose African Amethyst genuine natural 6 cts 12x12x8mm U52

 We sell rough and cut gemstones, offering a wide range of rough gemstones for specimen-cabbing-facet and beautiful cut stones ready for your mount..Either for a new piece of jewelry or replacing a stone in an existing piece of jewelry.We offer thousands of lots, all with individual photos, what you see in the photo is what you will receive. Tommysrocks, an internet only business since 2002, giving our internet customers 100% of our attention.

CLARITY SCALE
IF VERY HIGH QUALITY & NO INCLUSIONS.
VVS HIGH QUALITY WITH VERY SLIGHT INCLUSIONS.
VVS1 HIGH QUALITY WITH SLIGHT  INCLUSION.
VS FINE QUALITY WITH  INCLUSION SLIGHTLY VISIBLE TO THE NAKED EYE.
VS1 FINE QUALITY WITH INCLUSION VISIBLE TO THE NAKED EYE.
SI GOOD QUALITY WITH  INCLUSIONS VISIBLE TO THE NAKED EYE.
SI1 INCLUSIONS BECOMING PROMINENT TO THE EYE.
I INCLUDED.

THIS GEMSTONE IS GRADED: I F

Mohs hardness: 7

Refractive index: 1.544-1.553

Critical angle: 40°

Specific gravity: 2.63-2.65

Cleavage: None

Fracture: Conchoidal, brittle.

Dispersion: Medium (.013)

Heat sensitivity: Low

Pleochroism: Amethyst: very weak (purple to grayish purple); Natural citrine: weak (yellow to light-yellow); Prasiolite: very weak (light-green to paler green); Rock crystal: colorless, no dichroism; Rose quartz: weak (pink to paler pink); Natural dark smoky: definite (brown to reddish-brown).

Birefringence (double refraction): Weak (.009)

Crystal structure: Hexagonal

Cutting: Quartz cuts easily.  Pre-polishing with 1200 Nubond or 3000 standard lap will make polishing much quicker and more enjoyable.

Polishing: Cerium oxide on most common polishing laps.

General Gemstone Details
Quartz is a power stone, and has been called as well as considered world wide as the "Universal Crystal".   It is the most recognized type of crystal, and what many people envision when the thought of "crystal" comes to mind.   In fact there are many different types of Quartz, in quite a variety of colors. 
"Rock Crystal" Encompasses a large family of stones and crystals, all of which are made up primarily of silicon dioxide, one of the most common and most important substances in the world. Crystals of pure Quartz, generally six-sided, can be found in all shades and colors. Quartz crystals grow singularly or in groups and take on different shapes according to the temperature at the time of their formation. Quartz crystals can also contain other minerals "frozen" within, as in Rutilated Quartz. Quartz can be formed of microscopic crystals and take on entirely different appearances and qualities. 

Quartz can be a bit of a confusing stone, as it encompasses a great many varieties that often are thought to be gemstones on their own, but are in fact another type of quartz.  As well, within the quartz family there are other stones, which have their own little "families" as well.  Here is a breakdown of the most common quartz varieties:

Scientific Properties:
Mohs Hardness of 7 with a trigonal crystal structure.
The name "quartz" comes from the Greek derivative krustallos, meaning ice, as it was thought that quartz was actually ice formed by the Gods.  Since the Middle Ages, crystal balls made of rock crystal have been used to predict the future.

Mystical Properties:
Visual clarity normally isn't as important to a quartz crystal's energetic quality and ability to amplify subtle energies around it.  Quartz enhances energy by absorbing, storing, balancing, amplifying, focusing and transmitting the energy...it channels universal energy as well, and is quite successful for energizing other crystals. 
Quartz  crystals can raise energy to the highest possible level, it enhances thoughts, as they are a form of energy, and it is extremely beneficial for manifesting, healing, meditation, protection and channeling. Containing every possible color, Clear Quartz works on all levels of the