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LOOSE YELLOW ORTHOCLASE        NATURAL COLOR            Hardness 6

RETURN TO ORTHOCLASE

66.20 cts. Octagon yellow orthoclase single
  x Pieces: 1 Orthoclase x Type:  100%Natural
 
  Color: Yellow   Shape: Octagon faceted
                 
  Weight: 66.20 Carats   Size: 27.75 x 23.3 mm.
 
  Clarity: Slightly included   Luster: Excellent
 
  Treatment: None (N)   Origin: Madagascar
We use a  microscopic photography    Refr. Index: 1.52 - 1.53   Hardness 6
system. The actual gemstone is smaller than the images shown.  Depth: 15 mm 
This is a virtual certificate compiled from the lab data for the gemstone being examined. Clarity is based on magnification
under a 10X corrected loupe. All gemology performed by GGGems. Jean & Alain Darbellay guaranteeing that this stone  
 is 100% natural. Prices and availability are subject to change without notice.
Stone Price:  USD 2990.00 

ref:Oye 6620

   

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- Scale determining the purity of a stone.  -
FL NFL SI1 SI2 MI1
Flaw less Near flaw less Slightly included 1 Slightly included 2 Medium included 1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
MI2 MI3 VI1 VI2 HI
Medium included 2 Medium included 3 Very included 1 Very included 2 Highly included
 

General Information

 Chemical Formula: KAlSi3O8
 Composition: Molecular Weight = 278.33 gm
   Potassium 14.05 %  K    16.92 % K2O
   Aluminium   9.69 %  Al   18.32 % Al2O3
   Silicon  30.27 %  Si   64.76 % SiO2
   Oxygen   45.99 %  O
             ______        ______
             100.00 %      100.00 % = TOTAL OxIDE
 Empirical Formula: KAlSi3O8
 Environment: Intrusive and extrusive igneous, and metamorphic rocks.
 IMA Status: Approved IMA 1960
 Locality: Common world wide occurrences.  Madagascar
 Name Origin: From the Greek orthos - "right" and kalo -" I cleave" in allusion to the mineral's right angle of good cleavage.
 Synonym: Adularia
 
 
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