Wisconsin Moonstone Value Guide

The Wisconsin Moonstone is a prized variety of plagioclase feldspar sourced from the Wausau area, celebrated by Midwestern rockhounds since the mid-20th century. Its distinctive appeal lies in a mesmerizing blue and violet adularescence created by light scattering between microscopic layers of albite and orthoclase.

What affects the value of Wisconsin Moonstone?

• The intensity and visibility of the blue and violet adularescence significantly impact the market price.
• The overall size and weight of the raw specimen, with larger pieces commanding the higher end of the $15-$25 range.
• The clarity of the internal glow and the absence of excessive external matrix or dull inclusions.
• Current demand among regional collectors and rockhounds specializing in Midwestern minerals.

How to Identify Wisconsin Moonstone?

• Look for a distinct internal blue or violet glow known as adularescence when the stone is rotated.
• Verify the specimen is a raw, unpolished plagioclase feldspar with a characteristic crystalline structure.
• Confirm the origin as the Wausau region of Wisconsin, where these specific albite and orthoclase compositions occur.
• Check for the presence of microscopic layering that causes the light-scattering effect.

History of Wisconsin Moonstone

Commonly found in the Wausau area of Wisconsin, this unique variety of feldspar has been a favorite among Midwestern rockhounds since the mid-20th century. It is prized for its internal glow, which is caused by light scattering between microscopic layers of albite and orthoclase.