mineral
Blue Quartz (Dumortierite Quartz / Celestite)
Silicon Dioxide (SiO2) with inclusions
Hardness: 7 on Mohs scale (for quartz base); Color: pale soft blue to lavender-blue with whitish internal inclusions; Luster: vitreous to waxy (when polished); Crystal System: Trigonal (microcrystalline/massive form); Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale (for quartz base)
- Luster
- vitreous to waxy (when polished)
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Physical properties
Hardness: 7 on Mohs scale (for quartz base); Color: pale soft blue to lavender-blue with whitish internal inclusions; Luster: vitreous to waxy (when polished); Crystal System: Trigonal (microcrystalline/massive form); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed in igneous, metamorphic, or pegmatitic environments where quartz crystallizes along with blue fibrous minerals like dumortierite, tourmaline, or actinolite inclusions that give it a distinctive blue hue.
Uses & applications
Popular in lapidary arts, jewelry, tumbled stones, pocket palm stones, and metaphysical collection.
Geological facts
Natural blue quartz is relatively rare compared to other quartz varieties like amethyst or citrine. Its blue coloration is typically caused by tiny microscopic inclusions of blue minerals trapped within the transparent quartz matrix during crystal growth.
Field identification & locations
Identified by its quartz hardness (scratches glass), smooth polished tumble texture, and cloudy pale blue to lavender-blue appearance with fibrous or specked internal veil patterns. Commonly sourced from Brazil, Madagascar, and South Africa.
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