Iridescent Hematite Value Guide

Iridescent Hematite, often called Turgite, is a striking mixture of hematite and goethite prized for its vibrant, rainbow-like light interference. These specimens are highly collectible due to their unique metallic luster and their historical connection to the famous Graves Mountain kyanite mine in Georgia.

What affects the value of Iridescent Hematite?

• Intensity and variety of the iridescent colors, with full-spectrum 'rainbow' pieces commanding higher prices.
• The overall size and structural integrity of the hematite or goethite matrix.
• The presence of secondary minerals like kyanite or pyrophyllite which are common at the Graves Mountain site.
• The lack of scuffing or damage to the delicate iridescent surface layer.

How to Identify Iridescent Hematite?

• Look for a thin, multi-colored film of iron oxide that creates a 'rainbow' effect across the surface of the specimen.
• Verify the base material is a combination of dark, metallic hematite or earthy goethite.
• Check for the characteristic botryoidal or massive growth habits typical of Graves Mountain mineral deposits.
• Confirm the origin is the United States, specifically localities known for kyanite and iron oxide associations.

History of Iridescent Hematite

Commonly referred to as turgite, this material is a mixture of hematite and goethite. The vibrant rainbow colors are caused by a thin film of iron oxide that creates light interference. The most famous locality for these specimens is Graves Mountain in Georgia, USA, which was a kyanite mine that produced world-class iridescent minerals in the mid-20th century.