Labradorite
What is Labradorite?
Labradorite is a feldspar mineral that is most commonly found in mafic igneous rocks. It’s known for its stunning iridescence, which is commonly referred to as labradorescence. This unique visual effect is caused by the interference of light within the layers of the mineral, creating a vivid play of color that can range from blue and green to yellow, orange, or even red. Labradorite is primarily found in Canada, although it can also be sourced from other countries including Madagascar, Ukraine, and the United States.
Labradorite is a captivating mineral known for its iridescent play of colors, often appearing in shades of blue, green, yellow, and sometimes even orange or red. This unique visual phenomenon, known as labradorescence, has made it a highly sought-after material for jewelry and decorative items. Its mystical appearance has also made it a popular choice for those interested in the metaphysical properties of gemstones.
| Chemical Classification | Inorganic - Feldspar |
| Color | Typically gray-green, dark gray, black, or grayish-white, with colorful iridescence. |
| Streak | Brown to Brownish Green |
| Luster | Vitreous to pearly, especially on cleavage surfaces. |
| Transparency | Transparent to translucent. |
| Occurrence | Canada, Madagascar, Ukraine. |
| Formation | Labradorite is formed in igneous rocks and is also found in metamorphic amphibolites. |
| Diaphaneity | Translucent with labradorescence |
| Cleavage | Perfect in two directions |
| Mohs Hardness | 6 to 6.5. |
| Specific Gravity | Approximately 2.68 to 2.72. |
| Diagnostic Properties | Labradorescence (play of colors). |
| Chemical Composition | (Ca,Na)(Si,Al)4O8 |
| Pleochroism | Not exhibited in labradorite. |
| Crystal System | Triclinic |
| Optical Properties | Biaxial (+) |
| Refractive Index | 1.560 - 1.572 |
| Birefringence | 0.008 - 0.010 |
| 2V angle | Measured: 85° to 90° |
| Dispersion | Not typically relevant for labradorite. |