Star Garnet
| Star Almandite |
| Refractive Index : 1.790 (+0.030 – 0.030) |
| Optical Characteristic : SR, ADR |
| Specific Gravity : 4.05 (+0.25 – 0.12) |
| Formula : Fe++3AI2(SiO4)3 |
| Crystal System : Cubic |
| Variety/Species : Almandite |
| Species/Group : Garnet group |
| Birefringence : none |
| Dispersion : 0.024 |
| Hardness : 7 to 7.5 |
| Toughness : Fair to good |
| Ultrasonic : Usually safe |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Avoid abrupt temperature change |
| Acids : No reaction |
| Light : stable |
| Polish Luster : vitreous to subadamantine |
| Fracture : conchoidal |
| Fracture Luster : greasy to vitreous |
| Clarity Type : N/A |
| Tones : 2-8 |
| Saturations : 1-5 |
| Cause of Color : Iron |
| Enhancements : none |
| Cleavage : None. May show indistinct parting. |
| Color Range : Very dark red, purple, reddish purple, purple-red, red-purple, purplish Stones could qualify as rhodolite or spessartite |
| Transparency : Semitransparent to opaque |
| Phenomena : Adularescence, 6 ray star, 4 ray star Usually 4 ray star |
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| Separations : Star Garnet from- Star Ruby : optic character, magnification, spectrum, pleochroism (possibly), RI (possibly) Synthetic Star Ruby : RI, optic character, magnification spectrum, pleochroism, fluorescence (possibly) Star spinel : RI, spectrm, SG (possibly) |
| Identifying Characteristics and information Needle-like inclusions (usually coarse), zircon crystals with strain halos, and irregular, rounded included crystals of low relief. |
| Spectral Data strong bands at 5040, 5200, 5730. May Show lines at 4230,4600, 6100, 6800-6900. |
| Trade Names and Misnomers Star Garnet |
Tags: Almandite, garnet group, star almandine, star almandite, star garnet
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