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Grandreefite

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Formula:
Pb
 
2
(SO
 
4
)F
 
2
System:MonoclinicColour:Colourless
Hardness:
Name:Named for the type locality.


A rare secondary lead sulphate fluoride. Decomposed by water.

Structurally related to Unnamed (Ba Thiosulphate Fluoride).

Classification of Grandreefite

IMA status:Approved 1988
Strunz 8th edition ID:6/B.13-30
Nickel-Strunz 10th (pending) edition ID:7.BD.45

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
Dana 8th edition ID:12.1.2.1

12 : COMPOUND HALIDES
1 : Miscellaneous
Hey's CIM Ref.:26.22

26 : Sulphates with Halide
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Type Occurrence of Grandreefite

Type Locality:Grand Reef Mine (Aravaipa Mine; Lead Jewel; Joe Rubal Mine; Vivian Mine; Calistoga Mining & Development Co. Mine; Bringham Silver and Lead Mine), Laurel Canyon, Grand Reef Mountain, Klondyke, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
Year of Discovery:1988

Physical Properties of Grandreefite

Colour:Colourless
Hardness (Mohs):

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 Volume:V 523.15 ų (Calculated from Unit Cell)
Z:4
Twinning: Coarse polysynthetic twins of undetermined
law observed only in transmitted light under crossed polars.
Comment:Space group A2/a.
X-Ray Powder Diffraction:
d-spacingIntensity
3.159 (100)
3.116 (90)
3.084 (80)
2.281 (50)
1.824 (50)
1.806 (60)
1.370 (50b)

Optical Data of Grandreefite

Type:Biaxial (+)
RI values: nα = 1.872 nβ = 1.873 nγ = 1.897
2V:Measured: 23° , Calculated: 24°
Maximum Birefringence:δ = 0.025

Chart 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:
Pb
 
2
(SO
 
4
)F
 
2
Simplified for copy/paste:Pb2(SO4)F2
Essential elements:F, O, Pb, S
All elements listed in formula:F, O, Pb, S

Relationship of Grandreefite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.BD.05Sulphohalite
Na
 
6
(SO
 
4
)
 
2
FCl
7.BD.05Sulfohalite
7.BD.10Galeite
Na
 
15
(SO
 
4
)
 
5
F
 
4
Cl
7.BD.10Schairerite
Na
 
3
(SO
 
4
)(F,Cl)
7.BD.15Kogarkoite
Na
 
3
(SO
 
4
)F
7.BD.20Caracolite
Na
 
3
Pb
 
2
(SO
 
4
)
 
3
Cl
7.BD.20Cesanite
Na
 
3
Ca
 
2
(SO
 
4
)
 
3
(OH)
7.BD.20Aiolosite
Na
 
4
Bi(SO
 
4
)
 
3
Cl
7.BD.25Burkeite
Na
 
6
(CO
 
3
)(SO
 
4
)
 
2
7.BD.30Hanksite
Na
 
22
K(SO
 
4
)
 
9
(CO
 
3
)
 
2
Cl
7.BD.35Cannonite
Bi
 
2
(SO
 
4
)O(OH)
 
2
7.BD.40Lanarkite
Pb
 
2
(SO
 
4
)O
7.BD.50Itoite
Pb
 
3
Ge
4+
 
(SO
 
4
)
 
2
O
 
2
(OH)
 
2
7.BD.55Chiluite
Bi
 
3
Te
6+
 
Mo
6+
 
O
 
10.5
7.BD.60Hectorfloresite
Na
 
9
(SO
 
4
)
 
4
(IO
 
3
)
7.BD.65Pseudograndreefite
Pb
 
6
(SO
 
4
)F
 
10
7.BD.70Sundiusite
Pb
 
10
(SO
 
4
)O
 
8
Cl
 
2
Related Minerals - Hey's Index Grouping:

- +
26.1Kogarkoite
Na
 
3
(SO
 
4
)F
26.2Sulphohalite
Na
 
6
(SO
 
4
)
 
2
FCl
26.3Schairerite
Na
 
3
(SO
 
4
)(F,Cl)
26.4Galeite
Na
 
15
(SO
 
4
)
 
5
F
 
4
Cl
26.5Connellite
Cu
 
19
(SO
 
4
)(OH)
 
32
Cl
 
4
· 3H
 
2
O
26.6Chlorothionite
K
 
2
Cu(SO
 
4
)Cl
 
2
26.7Kamchatkite
KCu
 
3
(SO
 
4
)
 
2
OCl
26.8Spangolite
Cu
 
6
Al(SO
 
4
)(OH)
 
12
Cl · 3H
 
2
O
26.9Aubertite
CuAl(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.10Magnesioaubertite
(Mg,Cu)Al(SO
 
4
)
 
2
Cl · 14H
 
2
O
26.11Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)(SO
 
4
)
 
2
F · 14H
 
2
O
26.12D'Ansite
Na
 
21
Mg(SO
 
4
)
 
10
Cl
 
3
26.13Anhydrokainite
KMg(SO
 
4
)Cl
26.14Kainite
KMg(SO
 
4
)Cl · 3H
 
2
O
26.15Mosesite
(Hg
 
2
N)(Cl,SO
 
4
,MoO
 
4
) · H
 
2
O
26.16Kleinite
(Hg
 
2
N)(Cl,SO
 
4
) · nH
 
2
O
26.17Wilcoxite
MgAl(SO
 
4
)
 
2
F · 17H
 
2
O
26.18Creedite
Ca
 
3
SO
 
4
Al
 
2
F
 
8
(OH)
 
2
· 2H
 
2
O
26.19Lannonite
Mg
 
2
Ca
 
4
Al
 
4
(SO
 
4
)
 
8
F
 
8
· 24H
 
2
O
26.20Chukhrovite-(Y)
Ca
 
3
(Y,Ce)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.21Chukhrovite-(Ce)
Ca
 
3
(Ce,Y)[F|SO
 
4
|(AlF
 
6
)
 
2
] · 10H
 
2
O
26.23Pseudograndreefite
Pb
 
6
(SO
 
4
)F
 
10
26.24Sundiusite
Pb
 
10
(SO
 
4
)O
 
8
Cl
 
2
26.25Caracolite
Na
 
3
Pb
 
2
(SO
 
4
)
 
3
Cl
26.26Mammothite
Pb
 
6
Cu
 
4
AlSb
5+
 
O
 
2
(OH)
 
16
Cl
 
4
(SO
 
4
)
 
2
26.27Atlasovite
K(BiO)Cu
 
6
Fe
3+
 
(SO
 
4
)
 
5
O
 
3
Cl
26.28Xitieshanite
Fe
3+
 
(SO
 
4
)Cl · 6H
 
2
O
26.29Nabokoite
KCu
 
7
(SO
 
4
)
 
5
(Te
4+
 
O
 
3
)OCl

Other Names for Grandreefite

Synonyms:
IMA1988-016
Other Languages:
German:Grandreefit
Russian:Грандрифит
Spanish:Grandreefita

Other Information

Health Warning: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:

- +
Kampf, A.R., et al. (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.

Mineralogical Record: 27: 296.

Internet Links for Grandreefite

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  • Localities for Grandreefite

    The 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. ? 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
     
    • 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.
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