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Lazulite

#PD45154

Lazulite

#PD45154
Availability
Sold
Size
8 x 4.5 x 3 cm - Sm Cabinet 
Formula
MgAl2(PO4)2(OH)2 (RRUFF)
Locality
Palermo mine, Groton, Grafton Co., New Hampshire, United States
Tagged
phosphate , pegmatite mineral

Scattered, rich coverage of 1-3mm grains of Lazulite in Albite or Microcline matrix.

Lazulite was found in the core zone at Palermo. A large mass of Lazulite-Scorzalite was found adjacent to hydrothermally altered Triphylite at Palermo. The Lazulite was apparently resistant to the chemical attack (Moore, 1973 Min. Record). It is not clear if Lazulite is a primary phase mineral. Scorzalite, the Fe+2 analogue of Lazulite, was found rimming (Ferro)Wyllieite at the Victory mine in SD.  Here it was found in the wall zone. It occurs at the White Cap mine, Keystone, SD as secondary 1mm crystals in decayed feldspar. 

Worldwide, it occurs in several geological environments from pegmatites, sedimentary to highly metamorphosed quartzite grade rocks containing high aluminum. Notable localities of metamorphosed terrain include the 15cm masses at Champion mine, Mono Co., California and Graves Mountain, Georgia. At Hålsjöberg, Värmland, Sweden excellent pyramidal crystals occur to 12cm. Superb, probably the best, often twinned, dark blue lustrous crystals occur at Rapid Creek, Yukon, Canada.

Lazulite is rather rare in pegmatites and crytals are rare. Most occurences may be Scorzalite. 

Lazulite

Formula
MgAl2(PO4)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Pyramidal 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, blue green, light blue, black blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5-6 

Data courtesy of Webmineral.

Collection
Phillips Collection
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