Gainesite Mineral Data

Gainesite Mineral Data +

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General Gainesite Information

Chemical Formula:

Na2Zr2Be(PO4)4·1-2(H2O)

Composition:

Molecular Weight = 639.49 gm

Cesium 2.08 % Cs 2.20 % Cs₂O

Potassium 1.83 % K 2.21 % K₂O

Sodium 5.75 % Na 7.75 % Na₂O

Lithium 0.11 % Li 0.23 % Li₂O

Calcium 0.63 % Ca 0.88 % CaO

Zirconium 24.25 % Zr 32.76 % ZrO₂

Beryllium 0.85 % Be 2.35 % BeO

Iron 0.87 % Fe 1.12 % FeO

Phosphorus 19.37 % P 44.39 % P₂O₅

Hydrogen 0.47 % H 4.23 % H₂O

Oxygen 43.78 % O

______ ______

100.00 % 98.12 % = TOTAL OXIDE

Empirical Formula:

Na_1.6K_0.3Cs_0.1Be_0.6Li_0.1Zr_1.7Fe²⁺_0.1Ca_0.1(PO₄)₄·1.5(H₂O)

Environment:

Accessory mineral in a granite pegmatite.

IMA Status:

Approved IMA 1983

Locality:

Nevel quarry, Newry, Oxford County, Maine, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Richard Venable Gaines (1917-1999), American mineralogist, economic geologist, and mineral collector of Earlysville, Virginia, USA, for his interest in beryllium minerals.

Synonym:

ICSD 31199

PDF 35-604

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Gainesite Crystallography

Axial Ratios:

a:c = 1:2.60682

Cell Dimensions:

a = 6.567, c = 17.119, Z = 2; V = 738.27 Den(Calc)= 2.88

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 6.068(1), 3.265(0.9), 3.023(0.5),

Crystal Structure:

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Moore P B , Araki T , Steele I M , Swihart G H , Kampf A R , American Mineralogist , 68 (1983) p.1022-1028, Gainesite, sodium zirconium beryllophosphate: A new mineral and its crystal, structure

Physical Properties of Gainesite

Color:

Blue.

Density:

2.94

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Optical Properties of Gainesite

Gladstone-Dale:

CI meas= -0.079 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2167,KPDmeas= 0.2122,KC= 0.1967

Optical Data:

Uniaxial (+), w=1.618, e=1.63, bire=0.0120.

Calculated Properties of Gainesite

Electron Density:

r_electron=2.82 gm/cc
note: r_Gainesite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.03615
Boson Index = 0.96385

Photoelectric:

PE_Gainesite= 42.30 barns/electron
U=PE_Gainesite x r_electron= 119.44 barns/cc.

Radioactivity:

GRapi = 25.43 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Gainesite - barely detectable

Gainesite Classification

Dana Class:

40.5.4.1 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.4)Dana Group

40.5.4.1 Gainesite Na2Zr2Be(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

40.5.4.2 Mccrillisite NaCs(Be,Li)Zr2(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

40.5.4.3 Selwynite NaK(Be,Al)Zr2(PO4)4·2(H2O) I 4₁/amd 4/m 2/m 2/m

Strunz Class:

VII/C.02-35 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.02 - Faheyite - Gainesite-(NaCs) series

VII/C.02-10 Faheyite (Mn,Mg)Fe2Be2(PO4)4·6(H2O) P 6₂22 6 2 2

VII/C.02-20 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 42₁m 4 2m

VII/C.02-25 Selwynite NaK(Be,Al)Zr2(PO4)4·2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-35 Gainesite Na2Zr2Be(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-40 Mccrillisite NaCs(Be,Li)Zr2(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

Other Gainesite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Gainesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Gainesite

Na2Zr2Be(PO4)4·1-2(H2O)
Dana No: 40.5.4.1 Strunz No: VII/C.02-35
Locality:

Notes: