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Grandreefite

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Formula:
Pb2(SO4)F2
Colour:
Colourless
Lustre:
Sub-Adamantine
Hardness:
Specific Gravity:
7.0(1)
Crystal System:
Monoclinic
Name:
Named by Anthony R. Kampf, Peter J. Dunn, and Eugene E. Foord in 1989 after the type locality of Grand Reef Mine, Arizona.
A rare secondary lead sulphate fluoride. Decomposed by water.

Structurally related to Unnamed (Ba Thiosulphate Fluoride).


Classification of Grandreefite

Approved
Approval Year:
1988
First Published:
1989
7.BD.45

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
12.1.2.1

12 : COMPOUND HALIDES
1 : Miscellaneous
26.22

26 : Sulphates with Halide

Physical Properties of Grandreefite

Sub-Adamantine
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
7.0(1) g/cm3 (Measured)    7.15 g/cm3 (Calculated)
Comment:
Measured with Berman balance using 3.43 mg of sample.

Optical Data of Grandreefite

Type:
Biaxial (+)
RI values:
nα = 1.872 nβ = 1.873 nγ = 1.897
2V:
Measured: 23° , Calculated: 24°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
very strong

Chemical Properties of Grandreefite

Formula:
Pb2(SO4)F2

Crystallography of Grandreefite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.667(1) Å, b = 4.4419(6) Å, c = 14.242(2) Å
β = 107.418(2)°
Ratio:
a:b:c = 1.951 : 1 : 3.206
Unit Cell V:
523.15 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic and striated parallel to [001]. The forms {l20}, {l30}, {293}, {2-93}, and {l01} were present.
Twinning:
Coarse polysynthetic twins of undetermined law observed only in transmitted light under crossed polars.
Comment:
Space group A2/a.

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
3.159 (100)
3.116 (90)
3.084 (80)
2.281 (50)
1.824 (50)
1.806 (60)
1.370 (50b)

Type Occurrence of Grandreefite

General Appearance of Type Material:
Isolated prismatic crystals
Place of Conservation of Type Material:
Natural History Museum, Los Angeles, California, USA, 33608.
National Museum of Natural History, Washington, D.C., USA, 166055.
Geological Setting of Type Material:
Epithermal lead-copper-silver deposit, which is hosted by a silicified breccia.
Associated Minerals at Type Locality:

Synonyms of Grandreefite

Other Language Names for Grandreefite

Common Associates

Associated Minerals Based on Photo Data:
Pseudograndreefite1 photo of Grandreefite associated with Pseudograndreefite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

7.BD.05SulphohaliteNa6(SO4)2FCl
7.BD.05SulfohaliteNa6(SO4)2FCl
7.BD.10GaleiteNa15(SO4)5F4Cl
7.BD.10SchaireriteNa21(SO4)7ClF6
7.BD.15KogarkoiteNa3(SO4)F
7.BD.20CaracoliteNa3Pb2(SO4)3Cl
7.BD.20CesaniteNa3Ca2(SO4)3(OH)
7.BD.20AiolositeNa4Bi(SO4)3Cl
7.BD.25BurkeiteNa6(CO3)(SO4)2
7.BD.30HanksiteNa22K(SO4)9(CO3)2Cl
7.BD.35CannoniteBi2(SO4)O(OH)2
7.BD.40LanarkitePb2(SO4)O
7.BD.50ItoitePb3Ge4+(SO4)2O2(OH)2
7.BD.55ChiluiteBi3Te6+Mo6+O10.5
7.BD.60HectorfloresiteNa9(SO4)4(IO3)
7.BD.65PseudograndreefitePb6(SO4)F10
7.BD.70SundiusitePb10(SO4)O8Cl2

Related Minerals - Hey's Chemical Index of Minerals Grouping

26.1KogarkoiteNa3(SO4)F
26.2SulphohaliteNa6(SO4)2FCl
26.3SchaireriteNa21(SO4)7ClF6
26.4GaleiteNa15(SO4)5F4Cl
26.5ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
26.6ChlorothioniteK2Cu(SO4)Cl2
26.7KamchatkiteKCu3(SO4)2OCl
26.8SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
26.9AubertiteCuAl(SO4)2Cl · 14H2O
26.10Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
26.11Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O
26.12D'AnsiteNa21Mg(SO4)10Cl3
26.13AnhydrokainiteKMg(SO4)Cl
26.14KainiteKMg(SO4)Cl · 3H2O
26.15Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
26.16Kleinite(Hg2N)(Cl,SO4) · nH2O
26.17WilcoxiteMgAl(SO4)2F · 17H2O
26.18CreediteCa3SO4Al2F8(OH)2 · 2H2O
26.19LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O
26.20Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2O
26.21Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2O
26.23PseudograndreefitePb6(SO4)F10
26.24SundiusitePb10(SO4)O8Cl2
26.25CaracoliteNa3Pb2(SO4)3Cl
26.26MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2
26.27AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3Cl
26.28XitieshaniteFe3+(SO4)Cl · 6H2O
26.29NabokoiteKCu7(SO4)5(Te4+O3)OCl

Fluorescence of Grandreefite

None observed.

Other Information

Notes:
Decomposes in cold water.
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 Grandreefite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Dunn, P.J., Foord, E.E. (1989) Grandreefite, pseudograndreefite, laurelite, and aravaipaite: Four new minerals from the Grandreef mine, Graham Co., Arizona. American Mineralogist: 74: 927-933.
Kampf, A.R. (1991) Grandreefite, Pb2F2SO4: crystal structure and relationship to the lanthanide oxide sulfates, Ln2O2SO4. American Mineralogist: 76: 278-282.
Kampf, A.R., Foord, E.E. (1996) Calcioaravaipaite, a new mineral, and associated lead fluoride minerals from the Grand Reef Mine, Graham County, Arizona. Mineralogical Record: 27: 293-300.

Internet Links for Grandreefite

mindat.org URL:
https://www.mindat.org/min-1738.html
Please feel free to link to this page.

Localities for Grandreefite

This 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.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Megala Pefka area
          • Megala Pefka Mines
Lapis, 24, 7/8 (1999)
USA (TL)
 
  • Arizona
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Klondyke
            • Grand Reef Mountain
              • Laurel Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 118, 238; Kampf, A.R., et al (1989), Grandreefite, pseudograndreefite, laurelite, and aravaipaite: Four new minerals from the Grandreef mine, Graham Co., AZ, Am.Min.: 74: 927-933; Min.Rec.: 27: 296.
Mineral and/or Locality  
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