Sunstone
is an interesting feldspar gemstone with a glittery appearance and usually an orange or reddish color, hence its name. The glitter effect is caused by inclusions of the mineral Hematite, or sometimes also Goethite or Pyrite (and in one rare instance, Copper). The term used to describe the glittery effect exhibited on Sunstone is aventurescence.
| Chemical Formula | Microcline: KAlSi3O8Oligoclase: (Na,Ca)Al1-2Si3-2O8 |
| Color | Red, Orange, Brown, Pink |
| Hardness | 6Â -Â 6.5 |
| Crystal System | Triclinic |
| Refractive Index | 1.525Â -Â 1.548 |
| SG | 2.62Â -Â 2.65 |
| Transparency | Transparent to translucent |
| Double Refraction | 0.01 |
| Luster | Vitreous |
| Cleavage | 2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal |
| Mineral Class | Microcline or Oligoclase |
is an interesting feldspar gemstone with a glittery appearance and usually an orange or reddish color, hence its name. The glitter effect is caused by inclusions of the mineral Hematite, or sometimes also Goethite or Pyrite (and in one rare instance, Copper). The term used to describe the glittery effect exhibited on Sunstone is aventurescence.
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