Burmalainen serendibiitti
Mineraali : Serendibiitti
Alkuperä : Burma
paino : 0,9ct
mitat ( noin ) : 7 x 6 x 4mm
soveltuvuus : keräilyyn , tunnistukseen , koruun sellaisenaan ja uudelleen hiontaan
huomioitavaa : läpinäkymätön kide
hakusanoja : jalokivi,raakakivi,keräilykivi,kide,mineraali,kivilaatu,serendibiitti,serendibite
Serendibite is an extremely rare boron-bearing mineral that is only rarely found as facet grade material. There appear to be only two sources for gem quality serendibite, the Ratanapura area in Sri Lanka, and the Mogok stone tract in Northern Myanmar. |
| Known Facts | |
| Color Key: | Blue, Blue green, Gray blue, Light yellow, Dark blue, Black. |
| Refractive Index:: | 1.701 - 1.706, |
| Chemical Composition: | Ca2(Mg,Al)6(Si,Al,B)6O20 |
| Hardness: | 6 - 7 |
| Density: | 3.40 |
| Crystal Group: | Triclinic |
| Ocurrence: | Gangapitija, Ambakotte, Sri Lanka; Ohn Gaing mine, Mogok, Myanmar; Tanzania; Franklin N.J., Johnsburg N.Y, U.S.A. |
| Before 2005, only three serendibites were thought to be in existence, all from Sri Lanka. The first two were discovered by rare stone specialist D. P. Gunasekera and purchased by the late Prof. E. J. Gübelin of Switzerland for around $14,000.00 per carat. More recently, facet quality serendibite was also discovered in the Mogok area of Northern Myanmar. Although the Sri Lankan stones were an attractive greenish or violetish blue, the dark black Burmese stones were still fetching prices of hundreds $ per ct. when they first appeared. Serendibite boasts an unusually complex formula consisting of calcium, magnesium, aluminum, silicon, boron and oxygen. It may be confused with sapphirine and zoisite, but can be identified as serendibite on the basis of refractive indices, twinning, and spectroscopic features. | |
