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Gainesite

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Richard V.Gaines
Formula:
Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
System:
Tetragonal
Colour:
Lavender to pale purple
Hardness:
4
Member of:
Name:
Named in 1983 by Paul Brian Moore, Takaharu Araki, Ian M. Steele., George H. Swihart and Anthony Robert Kampf in honor of the US American Richard Venable Gaines [January 25, 1917 Poughkeepsie, New York, USA - January 21, 1994 Earlysville, Virginia, USA], economic geologist with Cabot Minerals and others, mineralogist, and collector of pegmatite, especially Be minerals. He was also an expert in tellurium minerals and named a number of mineral species. He was senior author of the 8th edition of Dana's System of Mineralogy.
Minute steeply pyramidal, pale lilac to slightly blue purple crystals usually about 0.1-0.2 mm.

Classification of Gainesite

Approved 1978
8.CA.20

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.5.4.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
19.3.11

19 : Phosphates
3 : Phosphates of Be and Mg
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Type Occurrence of Gainesite

Place of Conservation of Type Material:
Smithsonian Institution
Year of Discovery:
1941
Geological Setting of Type Material:
Late stage granite pegmatite mineralization.
Associated Minerals at Type Locality:

Physical Properties of Gainesite

Sub-Adamantine, Vitreous
Diaphaneity (Transparency):
Transparent
Comment:
Very bright
Colour:
Lavender to pale purple
Comment:
Not a blue mineral.
Streak:
white
Hardness (Mohs):
4
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
2.94 g/cm3 (Measured)    2.84 g/cm3 (Calculated)

Crystallography of Gainesite

Crystal System:
Tetragonal
Class (H-M):
4mm - Ditetragonal Pyramidal
Space Group:
I41md
Cell Parameters:
a = 6.567Å, c = 17.119Å
Ratio:
a:c = 1 : 2.607
Unit Cell Volume:
V 738.27 ų (Calculated from Unit Cell)
Z:
2
Morphology:
{111}, {001}
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.07 (100)
4.24 (30)
3.27 (90)
3.02 (50)
2.88 (40)
2.17 (30)
2.01 (30)
1.673 (30)
Comments:
35-604

Optical Data of Gainesite

Type:
Uniaxial (+)
RI values:
nω = 1.618 nε = 1.630
Birefringence:
0.045
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Gainesite

Formula:
Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
Essential elements:
All elements listed in formula:

Relationship of Gainesite to other Species

Member of:
Other Members of Group:
MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2O
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2O
8.CA.15Faheyite(Mn,Mg,Na)Be2Fe2(PO4)4 · 6H2O
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2O
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2O
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
8.CA.30HopeiteZn3(PO4)2 · 4H2O
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2O
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2O
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2O
8.CA.45ScholziteCaZn2(PO4)2 · 2H2O
8.CA.50KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2O
8.CA.60ProsperiteCaZn2(AsO4)(HAsO4)(OH)
8.CA.65GengenbachiteKFe33+(HPO4)4(H2PO4)2 · 6H2O
8.CA.70ParahopeiteZn3(PO4)2 · 4H2O
19.3.1MoraesiteBe2(PO4)(OH) · 4H2O
19.3.2BerylloniteNaBePO4
19.3.3HurlbutiteCaBe2(PO4)2
19.3.4HydroxylherderiteCaBe(PO4)(OH,F)
19.3.5GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
19.3.6FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
19.3.7UraloliteCa2Be4(PO4)3(OH)3 · 5H2O
19.3.9PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
19.3.10TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
19.3.12RoscheriteCa2Mn52+Be4(PO4)6(OH)4 · 6H2O
19.3.13Faheyite(Mn,Mg,Na)Be2Fe2(PO4)4 · 6H2O
19.3.14FarringtoniteMg3(PO4)2
19.3.15HoltedahliteMg2(PO4)(OH)
19.3.16AlthausiteMg4(PO4)2(OH,O)(F,☐)
19.3.17NewberyiteMg(HPO4) · 3H2O
19.3.18PhosphorrössleriteMg(HPO4) · 7H2O
19.3.19BobierriteMg3(PO4)2 · 8H2O
19.3.20Barićite(Mg,Fe)3(PO4)2 · 8H2O
19.3.21Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2
19.3.22Dittmarite(NH4)Mg(PO4) · H2O
19.3.23Struvite(NH4)Mg(PO4) · 6H2O
19.3.24Hannayite(NH4)2Mg3H4(PO4)4 · 8H2O

Other Names for Gainesite

Name in Other Languages:
German:Gainesit
Spanish:Gainesita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Gainesite

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

American Mineralogist: 80: 1074.

Foord, E. E., Brownfield, M. E., Lichte, F. E., Davis, A. M. and Sutley, S. J. (1994): Mccrillisite, NaCs(Be,Li)Zr2(PO4)4.1-2H2O, a new mineral species from Mount Mica, Oxford County, Maine, and new data for gainesite. Can. Mineral. 32, 839-42.

Internet Links for Gainesite

Localities for Gainesite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
USA (TL)
 
  • Maine
    • Oxford Co.
      • Newry
Amer.Min.(1983) 68, 1022-1028; "Mineralogy of Maine, Vol. 1" by King, V.T. & Foord, E.E., Maine Geologic Survey, 1994
Mineral and/or Locality  
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