Lazulite


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lazulite

[′laz·ə‚līt]
(mineralogy)
(Mg,Fe)Al2(OH)2(PO4)2 A violet-blue or azure-blue mineral with vitreous luster; composed of basic aluminum phosphate and occurring in small masses or monoclinic crystals; hardness is 5-6 on Mohs scale, and specific gravity is 3.06-3.12. Also known as berkeyite; blue spar; false lapis.

Lazulite

 

a mineral, a phosphate of magnesium, iron, and aluminum; its chemical composition is (Mg, Fe2+) A12 [P04]2(OH)2. Lazulite crystallizes in the monoclinic system, forming dark blue acicular crystals of dipyramidal form. It sometimes occurs in granular aggregates in association with quartz and other minerals. Its hardness is 5–6 on Mohs’ scale, and its density is 3,100 kg/M3. Lazulite is encountered in the contact zones of pegmatites, in quartz veins, in quartzite and metamorphic rocks, and in association with corundum, rutile, kyanite, and other minerals.

References in periodicals archive ?
Rubies, sapphires and green pargasites from Hunza; rubies from Azad Kashmir; pink topaz crystals from Katlang in the Mardan district, North West Frontier Province; emeralds from Swat; peridots from the Sapat Valley in Kohistan; and the remarkable, gemmy and pleochroic lazulite crystals which probably, although not certainly, come from Laila Camp in the Gilgit district ...
Finally, the Ledfords had ten large single crystals of Georgia lazulite, dug in 1999: sandy, pale blue loose bipyramids with some adhering white mica/quartz dust.
(1959) Crystal structures of the isostructural minerals lazulite, scorzalite and barbosalite.
Lazulite (?) Mg[Al.sub.2][([PO.sub.4]).sub.2][(OH).sub.2]
The scuttlebutt this time concerned such matters as mineral-marketing websites, dichroic Pakistani lazulite crystals 5 cm long, and the news that major collector Steve Neely of Tennessee has now sold his fabulous collection of cabinet specimens.
Wendell has, to put it mildly, a good aesthetic eye, and thus the viewer's own eye lingers long on practically every piece, and the longer the lingering, the better seems the specimen in question: for instance, his Mexican ludlamite, Russian sperrylite, Afghanistan lazurite, Yukon lazulite, Russian pyrochlore, Sweet Home mine rhodochrosite .
Here too was what's said to be the largest lazulite crystal ever found at Graves Mountain: a loose, sharp, light sandy blue one 3.5 cm across.