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What is a Heliotrope Crystal?

Published in Mineral Varieties 1 min read

A heliotrope crystal is a distinctive variety of chalcedony, characterized by its deep green body adorned with striking red spots. It is often appreciated for its unique and vibrant appearance.

Understanding Heliotrope's Composition

Heliotrope is fundamentally a cryptocrystalline form of silica (SiO2). Its primary constituent is quartz, forming the dense, opaque green base of the stone. The characteristic green hue found in heliotrope is typically due to the presence of inclusions of chlorite or other green minerals embedded within its structure.

The Distinctive Appearance of Heliotrope

What makes heliotrope immediately recognizable are its vivid red specks or patches. These contrasting spots are caused by inclusions of iron oxide or red jasper dispersed throughout the green matrix of the crystal. This combination of deep green and contrasting red creates its notable visual appeal.

Key Characteristics of Heliotrope

For a quick overview of a heliotrope crystal's essential features:

Characteristic Description
Mineral Type A variety of chalcedony
Chemical Formula SiO2 (Silica)
Main Constituent Quartz
Green Color Source Inclusions of chlorite or other green minerals
Red Spot Source Inclusions of iron oxide or red jasper
Appearance Opaque green stone with distinctive red spots