Gorceixite Mineral Data

Gorceixite Mineral Data +

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General Gorceixite Information

Chemical Formula:

BaAl3(PO4)(PO3OH)(OH)6

Composition:

Molecular Weight = 511.27 gm

Barium 26.86 % Ba 29.99 % BaO

Aluminum 15.83 % Al 29.91 % Al₂O₃

Phosphorus 12.12 % P 27.76 % P₂O₅

Hydrogen 1.38 % H 12.33 % H₂O

Oxygen 43.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₃(PO₄)(PO₃OH)(OH)₆

Environment:

Alteration of apatite in fossil bones found in Cretaceous sandstone. The original fine structure of the bone is preserved.

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Bauru Basin, southern Brazil. Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist Claude-Henri Gorceix (1842 - 1919) founder of the Mining School (Escola de Minas) in Ouro Preto.

Synonym:

Fava pebbles

Gorceixite Image

Images:

Gorceixite

Comments: Translucent platy crystals of gorceixite on tan siderite with white aragonite coatings.
Location: Rapid Creek, Yukon, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Gorceixite

Comments: Translucent, pseudohexagonal crystal of groceixite in matrix.
Location: Rapid Creek, Yukon, Canada. Scale: Crystal Size 3 mm.
© Tom Loomis / Dakota Matrix

Gorceixite Crystallography

Axial Ratios:

a:b:c =1.7337:1:1.0008

Cell Dimensions:

a = 12.1892, b = 7.0306, c = 7.0364, Z = 2; beta = 125.3° V = 492.13 Den(Calc)= 3.45

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.002(1), 5.753(0.8), 3.516(0.7),

Crystal Structure:

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Radoslovich E W , Slade P G , Neues Jahrbuch fur Mineralogie, Monatshefte , 1980 (1980) p.157-170, Pseudo-trigonal symmetry and the structure of gorceixite, Locality: Glen Alice area, New South Wales, Australia

View Additional jPOWD Structure files for Gorceixite
[1]

Physical Properties of Gorceixite

Cleavage:

None

Color:

Brown, Gray white, Sky blue, White.

Density:

3.323

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

6 - Orthoclase

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Gorceixite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1801,KPDmeas= 0.187,KC= 0.193

Optical Data:

Uniaxial (+), w=1.618, e=1.625, bire=0.0070.

Calculated Properties of Gorceixite

Electron Density:

r_electron=3.17 gm/cc
note: r_Gorceixite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.04808
Boson Index = 0.95192

Photoelectric:

PE_Gorceixite= 113.92 barns/electron
U=PE_Gorceixite x r_electron= 361.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gorceixite is Not Radioactive

Gorceixite Classification

Dana Class:

42.7.3.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.3)Dana Group

42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.4 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.6 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.7.3.7 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.7.3.8 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

VII/B.36-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.36 - Crandallite group

VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m

VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m

VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig

VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-125 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150* Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Gorceixite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Gorceixite

BaAl3(PO4)(PO3OH)(OH)6
Dana No: 42.7.3.2 Strunz No: VII/B.36-50
Locality:

Notes: