Leland Blue Slag Glass Value Guide

Leland Blue is a historic slag glass byproduct created by the Leland Lake Superior Iron Company between 1870 and 1885. These specimens are highly collectible regional treasures from Michigan's Leelanau Peninsula, prized for their unique industrial origin and natural lake-tumbled finish.

What Is Leland Blue Slag Glass Worth?

The typical price range for Leland Blue Slag Glass is $25 - $27 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• The intensity and rarity of the blue hue significantly impact the market value of the specimen.
• Physical size and weight of the raw slag piece, with larger unpolished examples commanding higher prices.
• The presence of unique swirl patterns or color gradients within the glass matrix.
• Overall surface condition and the degree of natural smoothing achieved through lake-tumbling.

How to Identify Leland Blue Slag Glass?

• Look for distinct blue-toned glass resulting from the specific iron ore smelting impurities of the late 19th century.
• Examine the surface for a natural, matte-to-glossy texture created by decades of tumbling in Lake Michigan's currents.
• Check for small pits or air bubbles within the glass, which are characteristic of raw industrial slag from the 1870-1885 era.
• Verify the specimen is unpolished and retains the organic, irregular shape typical of iron byproduct waste.

History of Leland Blue Slag Glass

Leland Blue is a unique byproduct of the iron smelting process used by the Leland Lake Superior Iron Company during the late 19th century. When the iron was separated from the ore, the remaining impurities formed a glassy slag that was dumped into Lake Michigan. Over time, these pieces have been naturally tumbled by the lake's currents and are now prized by collectors and jewelry makers as a regional treasure of Michigan's Leelanau Peninsula.