Epidote in Quartz Value Guide

Epidote in Quartz is a prized mineral specimen known for its distinct green prismatic crystals embedded within a clear or milky quartz matrix. These pieces are highly collectible because they represent specific hydrothermal alteration processes, showcasing the unique 'addition' of crystal growth that gives Epidote its Greek-derived name.

What affects the value of Epidote in Quartz?

• The clarity and transparency of the quartz matrix significantly impact the visibility and value of the Epidote inclusions.
• The size and structural integrity of the green Epidote prisms, with larger, unbroken crystals commanding higher prices.
• The overall aesthetic balance between the green mineral and the white or clear matrix, typically ranging from $25 to $50.
• The geographical origin of the specimen, with high-quality North American finds being particularly popular among regional collectors.

How to Identify Epidote in Quartz?

• Look for the characteristic pistachio-green to dark-green color of the Epidote crystals against the lighter quartz.
• Examine the crystal structure for elongated prisms where one side is notably longer than the others.
• Verify the hardness; Epidote should be between 6 and 7 on the Mohs scale, while the surrounding quartz is a 7.
• Check for the typical association with metamorphic rock origins, often appearing as needle-like inclusions or embedded clusters.

History of Epidote in Quartz

Epidote is a common rock-forming mineral found in regionally metamorphosed rocks of medium grade. Its name comes from the Greek word 'epidosis,' meaning 'addition,' referring to one side of the prism being longer than the other. Often found in association with quartz, it indicates specific geological conditions during its formation, particularly involving hydrothermal alteration.