Mineral Information and Data:

Brazilianite
NaAl3(PO4)2(OH)4 [CNMNC approved formula]

Named for Brazil, the country in which it was first found.

IMA status : Valid species (Pre-IMA 1945) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.05.07.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.07)
  
Nickel-Strunz
(10th edition) :
08.BK.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BK) With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/n
Unit cell: a = 11.229(6) Å, b = 10.142(5) Å, c = 7.098(4) Å β = 97.6°
Crystal Habit: Crystals typically equant, or spearhead-shaped, elongated along [100], with large {011}, {111}, also {010}, {110}, {301}, {101}, other forms, to 20 cm. May be radial fibrous, globular.
  
Color: Chartreuse-yellow, pale yellow, yellow-green; colorless in transmitted light
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 5.5
Measured Density: 2.98 g/cm3
Cleavage: On {010}, good
Tenacity: Brittle
Fracture: Conchoidal
Streak: White
  
Geologic Setting: A hydrothermal mineral in phosphate-rich zones of granite pegmatites; also in metamorphosed sedimentary deposits.
Mineral Association: Muscovite, albite, apatite, tourmaline ([Corrego Frio mine,] Brazil); whitlockite, apatite, quartz (Palermo #1 mine, New Hampshire, USA); amblygonite, lazulite-scorzalite, augelite, bertossaite, apatite (Buranga pegmatite, Rwanda).
  
Other Properties: Gemstone Rare.

 

Brazilianite
Origin: Smith mine, Newport, Sullivan Co., New Hampshire, U.S.A.
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Brazilianite
2 mm yelllowish equant crystals on matrix.
Origin: Palermo mine, Grafton Co., New Hampshire, United States
Sample size: 5 x 3 x 2 cm
Photo: Tom Loomis

 

Brazilianite
(zoom-in of above)

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