...G. Diego Gatta; Pietro Vignola; Martin Meven; Romano Rinaldi Abstract The chemical composition and the crystal structure of a gem-quality brazilianite from the Telírio pegmatite, near Linópolis, Minas Gerais, Brazil, [NaAl 3 (PO 4 ) 2 (OH) 4 , a = 11.2448(5) Å, b = 10.1539(6) Å, c = 7.1031(3) Å, β...

... mineral natromontebrasite NaAl(PO 4 )(OH,F) is reported from the Daheim pegmatite. In the Okatjimukuju pegmatite, montebrasite has been replaced by a number of phases including crandallite CaAl 3 (PO 4 ) 2 (OH) 5 ·H 2 O and brazilianite NaAl 3 (PO 4 ) 2 (OH) 4 . In one example, montebrasite has been...

...Clifford Frondel; Marie Louise Lindberg Abstract Brazilianite occurs in the Palermo pegmatite, North Groton, Grafton County, New Hampshire. It differs in crystal habit from that of the crystals from Brazil. Chemical analysis confirms the formula NaAl 3 (PO 4 ) 2 (OH) 4 . X -ray data...

...Cornelius S. Hurlbut, Jr.; Elizabeth J. Weichel Abstract Brazilianite, the new phosphate, Na 2 Al 6 P 4 O 16 (OH) 8 , is described by Pough and Henderson * as follows: monoclinic, β = 97°22′, perfect {010} cleavage; specific gravity 2.94; axial ratios a:b:c = 1.1056:1:0.6992. Copyright © 1946...

...Frederick H. Pough; Edward P. Henderson Abstract Brazilianite is a new monoclinic phosphate mineral, Na 2 Al 6 P 4 O 16 (OH) 8 . a:b:c = 1.1056: 1:0.6992; β=97°22', p 0 ' = 0.6377, q 0 ' = 0.6992, x'=0.1293. Perfect (010) cleavage. H = 5½, S.G. = 2.94, vitreous luster, yellow-green, translucent...

.... Hydrothermal and other alteration has formed brazilianite (a second Brazilian occurrence for this mineral), crandallite, wardite and apatite, from the amblygonite. Eosphorite, hureaulite, metastrengite, stewartite, ferri-sicklerite, heterosite, rockbridgeite(?), and a number of unidentified minerals, have been...

... 3 mm, embedded in scorzalite. Associated phosphate minerals are scorzalite, trolleite, montebrasite, bertossaite, brazilianite, with accessory augelite, triplite and lacroixite. The mineral is transparent and exhibits a dark-green to bronze colour, with a resinous lustre and with a greenish...

... feldspar, muscovite, beryl, columbite, possibly heterosite, and powdery coatings of Mn- and Fe-oxides; in the dumps of the pegmatite, there are numerous other phosphates including altered triphylite-lithophyllite, arrojadite, eosphorite, laueite, brazilianite, and fairfieldite. Bederite is very dark brown...

... is the result of subsolidus reactions with residual pegmatitic fluids. Spodumene has been replaced by eucryptite, albite, and micas. Alteration products of montebrasite include low-fluorine secondary montebrasite, crandallite (tentative), hydroxylapatite, muscovite, brazilianite, augelite (tentative...

...Figure 5. Optical photomicrographs from the Al-rich phosphatic nodules from the Buranga pegmatite. ( a ) Anhedral wyllieite crystal surrounded by brazilianite and quartz. Plane polarizers. ( b ) Anhedral and fractured montebrasite crystal surrounded by coarse-grained brazilianite and quartz...

... that occur at the locality include hurlbutite, tiny beryl-lonite crystals, small twinned crystals of amblygonite and brazilianite as small single crystals and as aggregates of parallely intergrown crystals up to an inch in length. Copyright © 1953 by the Mineralogical Society of America 1953...

... include albite, muscovite, quartz, scorzalite (new mineral), souzalite (new mineral), brazilianite, apatite, zircon, tapiolite, and two unidentified phosphate minerals. Detailed descriptions, with chemical analyses, are given for scorzalite and souzalite, both of which are hydrous iron magnesium aluminum...

..., jahnsite group species, mitridatite, pseudolaueite, laueite and stewartite. Accessory montebrasite, fairfieldite, eosphorite–childrenite, kastningite, brazilianite, and goyazite also occur. In particular, montebrasite that appears gray is rich in goyazite, fluorapatite, albite and muscovite appear...