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Properties of Sunstone (Oligoclase Feldspar) Sunstone is a fascinating type of feldspar gemstone that is characterized by a glittering look and, as the name suggests, a hue that is either orange or reddish. Inclusions of the mineral hematite, and occasionally also goethite or pyrite, are responsible for the glittering look (and in one rare instance, Copper). Aventurescence is the word that is used to describe the sparkling look that is displayed by sunstone.
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Mineral Group |
Tectosilicate |
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Cleavage |
Perfect cleavage that goes in two directions |
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Chemical Composition |
(Na,Ca)Al1-2Si3-2O8 |
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Fracture |
Uneven/conchoidal |
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Luster |
Vitreous |
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Diaphaneity |
Transparent to translucent |
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Color |
Colorless, white, very pale yellow to orange |
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Streak |
White |
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Mohs Hardness |
6 - 6.5 |
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Specific Gravity |
2.63 - 2.66 |
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Diagnostic Properties |
Hardness, cleavage (twinning and labradorescence shown by few specimens) |
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Crystal System |
Triclinic |
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Uses |
Gemstones, carvings, statues |
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Chakras |
Sacral and Solar Plexus Chakras |
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Zodiac |
None |
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Numerical Vibration |
6 & 7 |
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Metaphysical Uses |
Note: All crystals contain energy that can be used to amplify your intentions and manifestations through meditation and daily wear. |
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Geologic Setting |
Granodiorites and monozonites are both distinguished by the presence of oligoclase. Near some locations, most notably in Tvedestrand, Norway, the mineral has inclusions of hematite. These inclusions give the crystal a golden sheen and a sparkling appearance. |
The phase diagram below shows the relation between Oligoclase and Albite.
