What is Lazulite?
Lazulite is a deep blue magnesium aluminium phosphate whose colour, hardness and metamorphic setting make it a sought-after collector mineral.
Mineralogy and crystal structure
Reference formula: MgAl2(PO4)2(OH)2. Lazulite is a monoclinic phosphate and forms a solid-solution relationship with scorzalite through magnesium-iron substitution. Natural colour can shift toward green or pale blue as chemistry changes, so analysis and locality are useful for confirmation. Lazulite is classified with phosphates and has a monoclinic crystal system. Typical hardness is 5.5–6 on the Mohs scale and specific gravity is approximately 3.0–3.1.
Colour, lustre and habit
Typical colours include blue, blue-green, pale blue, white. The usual prismatic, tabular, granular habit and vitreous, pearly lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Lazulite forms in or is associated with aluminium- and phosphate-rich metamorphic rocks, quartz veins and hydrothermal alteration zones. Important documented localities include Austria, Brazil, the United States, Madagascar, Canada and Pakistan.
Saturated blue with genuine mineralogical depth
Lazulite brings the visual impact of a blue gemstone together with a clear metamorphic story. Its colour is strong enough for display, while its phosphate chemistry and relationship to scorzalite reward a closer look from a systematic collector.
Collecting and care
Avoid acids and harsh abrasion; protect sharp crystal edges and keep matrix specimens dry and labelled.
