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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).


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Classification of GrandreefiteHide

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 GrandreefiteHide

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 GrandreefiteHide

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 GrandreefiteHide

Formula:
Pb2(SO4)F2

Crystallography of GrandreefiteHide

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 DiffractionHide

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 GrandreefiteHide

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 GrandreefiteHide

Other Language Names for GrandreefiteHide

Common AssociatesHide

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

Related Minerals - Nickel-Strunz GroupingHide

7.BD.05SulphohaliteNa6(SO4)2FClIso. m3m (4/m 3 2/m)
7.BD.05SulfohaliteNa6(SO4)2FCl
7.BD.10GaleiteNa15(SO4)5F4ClTrig.
7.BD.10SchaireriteNa21(SO4)7ClF6Trig. 3m (3 2/m)
7.BD.15KogarkoiteNa3(SO4)FMon.
7.BD.20CaracoliteNa3Pb2(SO4)3ClMon.
7.BD.20CesaniteNa3Ca2(SO4)3(OH)Hex.
7.BD.20AiolositeNa4Bi(SO4)3ClHex. 6/m : P63/m
7.BD.25BurkeiteNa6(CO3)(SO4)2Orth.
7.BD.30HanksiteNa22K(SO4)9(CO3)2ClHex. 6/m : P63/m
7.BD.35CannoniteBi2(SO4)O(OH)2Mon. 2/m : P21/b
7.BD.40LanarkitePb2(SO4)OMon. 2/m : B2/m
7.BD.50ItoitePb3Ge4+(SO4)2O2(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
7.BD.55ChiluiteBi3Te6+Mo6+O10.5Hex.
7.BD.60HectorfloresiteNa9(SO4)4(IO3)Mon. 2/m : P21/b
7.BD.65PseudograndreefitePb6(SO4)F10Orth. 2 2 2 : F2 2 2
7.BD.70SundiusitePb10(SO4)O8Cl2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

26.1KogarkoiteNa3(SO4)FMon.
26.2SulphohaliteNa6(SO4)2FClIso. m3m (4/m 3 2/m)
26.3SchaireriteNa21(SO4)7ClF6Trig. 3m (3 2/m)
26.4GaleiteNa15(SO4)5F4ClTrig.
26.5ConnelliteCu19(SO4)(OH)32Cl4 · 3H2OHex. 6 m2 : P62c
26.6ChlorothioniteK2Cu(SO4)Cl2Orth. mmm (2/m 2/m 2/m) : Pnma
26.7KamchatkiteKCu3(SO4)2OClOrth. mmm (2/m 2/m 2/m) : Pnma
26.8SpangoliteCu6Al(SO4)(OH)12Cl · 3H2OTrig. 3m : P3 1c
26.9AubertiteCuAl(SO4)2Cl · 14H2OTric. 1
26.10Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
26.11Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2OTric.
26.12D'AnsiteNa21Mg(SO4)10Cl3Iso.
26.13AnhydrokainiteKMg(SO4)Cl
26.14KainiteKMg(SO4)Cl · 3H2OMon. 2/m : B2/m
26.15Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso.
26.16Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
26.17WilcoxiteMgAl(SO4)2F · 17H2OTric. 1 : P1
26.18CreediteCa3SO4Al2F8(OH)2 · 2H2OMon. 2/m : B2/b
26.19LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O Tet. 4/m : I4/m
26.20Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2OIso.
26.21Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2OIso.
26.23PseudograndreefitePb6(SO4)F10Orth. 2 2 2 : F2 2 2
26.24SundiusitePb10(SO4)O8Cl2Mon.
26.25CaracoliteNa3Pb2(SO4)3ClMon.
26.26MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2Mon. 2 : B2
26.27AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3ClTet. 4/mmm (4/m 2/m 2/m) : P4/ncc
26.28XitieshaniteFe3+(SO4)Cl · 6H2OMon.
26.29NabokoiteKCu7(SO4)5(Te4+O3)OClTet.

Fluorescence of GrandreefiteHide

None observed.

Other InformationHide

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 GrandreefiteHide

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 GrandreefiteHide

Localities for GrandreefiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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