Bytownite Value, Price, and Jewelry Information

What is Bytownite?

Bytownite is part of the plagioclase feldspar solid solution series. It has a composition closer to calcium-rich anorthite than sodium-rich albite, about 70-90% to 10-30%, respectively. Bytownites occur in a great variety of rock types and environments, However, transparent crystals are rare.

Does Bytownite Make a Good Jewelry Stone?

Some plagioclases, like labradorite, make popular gemstones. Nevertheless, with a hardness of 6 to 6.5 and perfect cleavage in one direction and good or imperfect in two others, bytownites are still susceptible to damage from scratches and blows against hard surfaces. As ring stones, bytownites would need protective settings. Use for earrings, pendants, and brooches would be more advisable.

Are There Synthetic Bytownites?

There are no known synthetic bytownites or treatments for natural specimens.

Where are Bytownites Found?

Chihuahua, Mexico produces gem-quality bytownites.

In the United States, reddish bytownite pebbles from Arizona and New Mexico have been faceted into small gems. Bytownites have also been reported from Plush, Oregon, a well-known locality for facetable labradorite crystals. Some of these feldspars may have a borderline composition and cross over into the bytownite range.

Other notable gem-quality sources include the following:

• United States: Minnesota; Montana; Oklahoma; South Dakota; Wisconsin.
• Japan; South Africa; Sweden; United Kingdom: England, Scotland.

How to Care for Bytownites

Due to their cleavage, avoid cleaning bytownites with mechanical cleaning systems, like steam and ultrasound. Clean them only with a soft brush, mild detergent, and warm water. Consult our gemstone jewelry cleaning guide for more recommendations.