metamorphic
Lazulite Quartzite
Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)
Hardness of 7 for quartz, vitreous to dull luster, color ranges from white and grey to distinct lavender or blue streaks from lazulite, massive crystal structure, uneven fracture.
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Physical properties
Hardness of 7 for quartz, vitreous to dull luster, color ranges from white and grey to distinct lavender or blue streaks from lazulite, massive crystal structure, uneven fracture.
Formation & geological history
Formed through the regional or contact metamorphism of quartz-rich sandstone under high temperature and pressure, with the introduction of phosphate-rich hydrothermal fluids containing magnesium and iron to form lazulite.
Uses & applications
Used primarily as a decorative stone, lapidary material for cabochons, and as a prized specimen for mineral and rock collectors.
Geological facts
Lazulite-bearing quartzites are relatively rare geological formations, often sought after for their striking pastel blue or purple hues which are naturally occurring and distinct from dyed stones.
Field identification & locations
Identify in the field by its hard quartz matrix combined with patches of vibrant lavender-blue minerals that do not effervesce with acid. Found in metamorphic terrains worldwide.
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