Star Ruby
| Refractive Index : 1.770 – 1.762 (+0.009 – 0.005) |
| Optical Characteristic : DR U-, AGG |
| Specific Gravity : 4.00 (+0.10 – 0.05) |
| Formula : AI2O3 |
| Crystal System : Trigonal |
| Variety/Species : Ruby |
| Species/Group : Corundum |
| Birefringence : 0.008 to 0.010 |
| Dispersion : 0.018 |
| Hardness : 9 |
| Toughness : good to excellent |
| Ultrasonic : Usually safe |
| Steam : Usually safe |
| UV Long : Inert to strong |
| UV Short : Inert to strong |
| Pleochroism : 2 colors |
| Strength : weak |
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| Pleochroism Colors : weak to none |
| Heat : may alter color or star |
| Acids : slightiy attacked by acids |
| Light : stable |
| Polish Luster : vitreous to subadamantine |
| Fracture : conchoidal |
| Fracture Luster : Vitreous |
| Clarity Type : ll |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : chromium; possibly modified by iron and titanium |
| Enhancements : Heating, diffusion, oil, dye |
| Cleavage : None. Frequant parting. |
| Color Range : Red, purplish red, purple-red, red-purple Reddish, purplish |
| Transparency : Semitransparent to opaque |
| Phenomena : Asterism, 6 ray star, 12 ray star Usually 6 ray. |
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| Separations : Star Ruby from- Synthetic star ruby : magnification, fluorescence (possibly) Star Almandite : optic character, magnification, plechroism, spectrum, Star Spinel : optic character, magnification, pleochroism. |
| Identifying Characteristics and information Silk (fine needle-like rutile crystals), 3 sets of rutile needles intersecting at 60 degree angles hexagonal growth lines, and color zoning. |
| Spectral Data Strong doublet @ 6942/6928. Weaker lines @ 6680 and 6592. Also lines @ 4765, 4750 and 4685. |
| Trade Names and Misnomers Star Ruby |
Tags: Corundum, Ruby, Trigonal
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