Sunstone
| Refractive Index : 1.590 – 1.527 |
| Optical Characteristic : DR, B-, AGG |
| Specific Gravity : 2.77 – 2.57 |
| Formula : (Na,Ca)(Si,AI)4O8 |
| Crystal System : Triclinic |
| Variety/Species : Oligoclase/Plagioclase |
| Species/Group : Feldspar group |
| Birefringence : 0.007 to 0.010 |
| Dispersion : N/A |
| Hardness : 6 to 6.5 |
| Toughness : poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : May fracture |
| Acids : Avoid hydrofluoric acid |
| 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 : Metal-like inclusions (copper or hematite) cause a sheen. |
| Enhancements : none |
| Cleavage : perfect and easy, 2 direction |
| Color Range : Yellow, orange, brown, brownish red, orangy red, red-orange, reddish orange. |
| Transparency : Transparent to opaque |
| Phenomena : Aventurescence |
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| Separations : Sunstone from- Aventurine quartz : fracture, cleavage, appearance, spectrum, RI (possibly) Dyed quartz : fracture, cleavage, appearance, magnification, spectrum, RI(possibly) Goldstone glass : fracture, cleavage, appearance, magnification, optic character (possibly) Chalcedony : fracture, cleavage, phenomenon, RI (possibly) |
| Identifying Characteristics and information Sunstone (oligoclase) is a mineral species in the plagioclase series of the feldspar group. Has golden to reddish metallic-looking platelets. |
| Spectral Data not diagnostic. |
| Trade Names and Misnomers Aventuine Feldspar Heliocite Oregon Sunstone Sunstone |
Tags: Oligoclase, Plagioclase, sunstone, Triclinic
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