Serendibite gemstone information and display 

Serendibite gemstone information and display
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Serendibite is an extremely rare silicate mineral that was first discovered in 1902 in Sri Lanka. It named after Serendib, the old Arabic name of Sri Lanka (SERENDIB + ITE = SERENDIBITE).
The mineral is found in skarns associated with boron metasomatism of carbonate rocks where intruded by granite. Minerals occurring with serendibite include diopside, spinel, phlogopite, scapolite, calcite, tremolite, apatite, grandidierite, sinhalite, hyalophane, uvite, pargasite, clinozoisite, forsterite, warwickite and graphite.
General information about Serendibite gem
Category: Inosilicates
Formula: (Ca,Na)2(Mg,Fe2+)3(Al,Fe3+)3[O2|(Si,Al,B)6O18]
Strunz classification: 9.DH.40
Dana classification: 69.2.1a.6
Crystal system: Triclinic
Crystal class: Pinacoidal
Color: Black, pale yellow, blue-green, greyish blue
Twinning: Polysynthetic on {0-11} is common
Cleavage: None Observed
Mohs scale hardness: 6.5 - 7
Luster: Vitreous
Streak: White
Diaphaneity: Transparent, Translucent, Opaque
Specific gravity: 3.42 - 3.52 (measured) 3.47 (calculated)
Optical properties: Biaxial (+)
Refractive index: 1.701 - 1.706
Pleochroism: Visible, strong, color: green, blue, yellow, blue-green, light yellow
2V angle: Measured: 80°
Dispersion: strong
Details about displaying Serendibite gem:
Variety: Natural Serendibite
Weight: 14.68 carats
Dimension: 18.80 x 15.15 x 8.16 mm
Color: Black (Brown in transmitted light)
Transparency: Semi translucent
Shape: Oval
Cut: Brilliant
Pavilion: Step 4
Specific Gravity: 3.46