MOONSTONE 6 RAY STAR 17.19 CTS 13233 - EXTREMELY RARE GEM

MOONSTONE 6 RAY STAR 17.19 CTS 13233 - EXTREMELY RARE GEM

  • $790.00
  • $395.00

Carats 17.19
Size 19.5 x 11.6
Color Medium Grey
Clarity TRC/ VC
Shape Oval
Treatment None
Origin Sri Lanka
Location Colombo,Sri Lanka
Price $ 790.00
Ideal Gem for your collection
Collectors Gem! Suitable for gemological Institutions.
Large Sizes are Rare.
Among the Rarest of Gemstones.
Natural gem Free of any Treatment.
100% Natural - Not treated in any way.
Beautiful Center-stone for an engagement Ring.
Will make a Gorgeous Ring or Pendent accented with Diamonds.
Beautiful sharp Cats eye effect.
Large Sizes are Extremely Rare!
A Gem of Lasting Beauty.

R.I. :1.528 - 1.537 Hardness : 6
Chemical Comp. :Na[AlSi3O8]
Density :2.6 - 2.65
Crystal Group :Triclinic

Feldspar comes in white, yellow, or shades of red, orange to brown.Feldspar is a group of minerals related to each other in structure and chemical composition. Feldspar minerals are aluminum silicates of either potassium, sodium, and calcium. Most crystallize in the monoclinic nd triclinic systems. Cleavage is good in 2 directions forming nearly right angled prisms.Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO2) in their chemistry. This group includes aluminum silicates of soda, potassium, or lime. It is the single most abundant mineral group on Earth. They account for an estimated 60% of exposed rocks, as well as soils, clays, and other unconsolidated sediments, and are principal components in rock classification schemes. The minerals included in this group are the orthoclase, microcline and plagioclase feldspars. The top states producing feldspar are North Carolina, Virginia, California, Oklahoma, Idaho, Georgia and South Dakota, in descending order of estimated tonnage. Feldspar processors reported co-product recovery of mica and silica sand. Feldspar is mined from large granite bodies (called plutons by geologists), from pegmatites (formed when the last fluid stages of a crystallizing granite becomes concentrated in small liquid and vapor-rich pockets that allow the growth of extremely large crystals), and from sands composed mostly of feldspar. Because feldspar is such a large component of the Earth’s crust, it is assumed that the supply of feldspar is more than adequate to meet demand for a very long time to come. Present mines worldwide are adequately meeting the need for raw feldspar.

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