Gorceixite Mineral Data

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.

Name Pronunciation:

Gorceixite + Pronunciation

Synonym:

Fava pebbles

Gorceixite Image

Images:

Gorceixite Ferrazite

Comments: Translucent platy crystals of gorceixite on tan siderite with white aragonite coatings. Ferrazite is identical to gorceixite.
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:c = 1:2.44897

Cell Dimensions:

a = 7.0538, c = 17.2746, Z = 3; V = 744.36 Den(Calc)= 3.42

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

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

Physical Properties of Gorceixite

Cleavage:

None

Color:

Brown, Gray white, Sky blue, White.

Density:

3.323

Diaphaneity:

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= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1817,KPDmeas= 0.187,KC= 0.193
Ncalc = 1.64 - 1.66

Optical Data:

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

Calculated Properties of Gorceixite

Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Gorceixite =3.32 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Gorceixite= 113.92 barns/electron
U=PE_Gorceixite x rElectron Density= 361.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gorceixite is Not Radioactive

Gorceixite Classification

Dana Class:

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

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.03)Crandallite Group

42.07.03.01 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.02 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

42.07.03.03 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

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

42.07.03.05 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

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

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

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

Strunz Class:

08.BL.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Other Gorceixite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin 91:1951) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Gorceixite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Gorceixite Specimen Label here :

Gorceixite

BaAl3(PO4)(PO3OH)(OH)6
Dana No: 42.07.03.02 Strunz No: 08.BL.10
Locality:

Notes:

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