Pure Dumortierite gemstones are rarely encountered. Most lapidary-grade Dumortierite is dense blue inclusions of Dumortierite within Quartz. These gemstones are often called by the confusing term "Dumortierite Quartz", or may even be called "Blue Quartz". The inclusions can be present throughout the Quartz, or in splotches or zones, resulting in light and dark blue color zones.
The properties listed above are inherent to pure Dumortierite. However, since most Dumortierite gemstones are actually
Quartz with Dumortierite inclusions, the properties listed under Quartz are the more accurate gemstone reference.
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