Andesine
| Refractive Index : 1.5590 – 1.568 (+/- 0.05) |
| Optical Characteristic : DR, Biaxial positive |
| Specific Gravity : 2.70 (+/- 0.05) |
| Formula : (Na,Ca)(Si,AI)4O8 |
| Crystal System : Triclinic |
| Variety/Species : Plagioclase Feldspar |
| Species/Group : Feldspar Group |
| Birefringence : 0.007 – 0.010 |
| Dispersion : N/A |
| Hardness : 6 to 7 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert to Weak |
| UV Short : Inert to Weak |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Sensitive |
| Acids : Sensitive |
| Light : Stable |
| Polish Luster : Vitreous |
| Fracture : Uneven to splintery |
| Fracture Luster : Vitreous to pearly |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : |
| Enhancements : None |
| Cleavage : Perfect and easy , 2 directions. |
| Color Range : Red, yellow, green, reddish, yellowish, greenish |
| Transparency : Transparent to Semitranslucent |
| Phenomena : None |
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| Separations : Andesine from- Chalcedony : birefringence, optic character sign, RI (possibly), fluorescence (possibly) Quartz : RI, cleavage, magnification, optic character, SG (possibly) Beryl : RI (possibly), cleavage, magnification, optic character sign |
| Identifying Characteristics and information Andesine is an intermediate member of the plagioclase series, close to Labradorite |
| Spectral Data Not Diagnostic. |
| Trade Names and Misnomers Andesine |
Tags: andesine, Feldspar Group, labradorite, Plagioclase Feldspar
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