LABRADORITE
Labradorite: Feldspar, Labradorescence, Properties & Care
Labradorite is a plagioclase feldspar famous for labradorescence: vivid flashes of blue, green, gold, or other colors that appear as light interacts with internal layers. It is popular in mineral collections, cabochons, carvings, and decorative objects.
Table of Contents
Formation and Geological Setting
Labradorite forms in igneous rocks such as gabbro and anorthosite and also occurs in some metamorphic rocks. Its internal microscopic structures develop as feldspar cools and separates into fine compositional layers, creating the optical effect.
Properties and Appearance
Labradorite has Mohs hardness around 6–6.5 and two cleavage directions typical of feldspar. The colorful flash is angle-dependent and may be strongest on polished surfaces. Not every labradorite specimen shows strong labradorescence.
Identification and Collecting
The flash can help recognize labradorite, but feldspar varieties and other materials can show similar optical effects. Examine specimens under a moving light and record locality data. Avoid confusing labradorescence with surface glitter or coatings.
Care and Handling
Clean with a soft cloth and mild soap if needed. Feldspar can scratch or chip, so avoid abrasives and hard impacts. Store polished pieces separately from harder minerals and protect thin or pointed areas.
Frequently Asked Questions
Can appearance alone confirm identity?
No. Visual clues are useful, but testing and reliable provenance may be needed to distinguish similar materials or detect treatments.
Is it suitable for everyday jewelry?
Durability varies by material; consider hardness, cleavage, fractures, and treatments before choosing a setting or cleaning method.
Further Reading & Sources
- Mindat — mineral data and locality references.
- Handbook of Mineralogy — technical descriptions.
- Gemological Institute of America — gem education.
- Wikipedia: LABRADORITE — general background and references.