Pseudograndreefite
A valid IMA mineral species
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About Pseudograndreefite
Formula:
Pb6(SO4)F10
Colour:
Colourless
Lustre:
Sub-Adamantine
Hardness:
2½
Specific Gravity:
7.0
Crystal System:
Orthorhombic
Name:
For the close resemblance to grandreefite.
A rare secondary lead sulphate fluoride.
The lower indices of refraction, larger 2V, and stronger dispersion are useful in distinguishing pseudograndreefite from grandreefite.
The lower indices of refraction, larger 2V, and stronger dispersion are useful in distinguishing pseudograndreefite from grandreefite.
Unique Identifiers
Mindat ID:
3298
Long-form identifier:
mindat:1:1:3298:4
GUID
(UUID V4):
(UUID V4):
e4e162f2-b040-4a07-9404-a6d5de795692
IMA Classification of Pseudograndreefite
Approved
Approval year:
1988
First published:
1989
Classification of Pseudograndreefite
7.BD.65
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
12.1.3.1
12 : COMPOUND HALIDES
1 : Miscellaneous
12 : COMPOUND HALIDES
1 : Miscellaneous
26.23
26 : Sulphates with Halide
26 : Sulphates with Halide
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Pgrf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Pseudograndreefite
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) 7.08 g/cm3 (Calculated)
Optical Data of Pseudograndreefite
Type:
Biaxial (+)
RI values:
nα = 1.864 nβ = 1.865 nγ = 1.873
2V:
Measured: 30° , Calculated: 40°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v
Optical Extinction:
X = c; Y = a; Z = b.
Chemistry of Pseudograndreefite
Mindat Formula:
Pb6(SO4)F10
Elements listed:
Crystallography of Pseudograndreefite
Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
F2 2 2
Setting:
F2 2 2
Cell Parameters:
a = 8.51 Å, b = 19.57 Å, c = 8.49 Å
Ratio:
a:b:c = 0.435 : 1 : 0.434
Unit Cell V:
1,413.93 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular on {010}. Forms include {010}, {100}, {001}, {2l0}, and {012}.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.204 Å | (100) |
1.779 Å | (70b) |
2.999 Å | (30) |
2.212 Å | (25) |
1.364 Å | (25b) |
3.89 Å | (20) |
2.123 Å | (20) |
Comments:
Grand Reef mine, Arizona, USA. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47b : [Sulfates and sulfites] | |
47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Pseudograndreefite
General Appearance of Type Material:
Square (pseudotetragonal) tabular crystals. The tablets form a subparallel aggregate measuring 4x1x4 mm.
Place of Conservation of Type Material:
Natural History Museum, Los Angeles, California, USA, 33608.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 166056.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 166056.
Geological Setting of Type Material:
Epithermal lead-copper-silver deposit, which is hosted by a silicified breccia.
Associated Minerals at Type Locality:
Reference:
Kampf, A.R., Dunn, P.J., Foord, E.E. (1989) Grandreefite, pseudograndreefite, laurelite, and aravaipaite: Four new minerals from the Grandreef mine, Graham Co., AZ. American Mineralogist: 74: 927-933.
Synonyms of Pseudograndreefite
Other Language Names for Pseudograndreefite
German:Pseudograndreefit
Spanish:Pseudograndreefita
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Pseudograndreefite associated with Grandreefite | Pb2(SO4)F2 |
Related Minerals - Strunz-mindat Grouping
7.BD. | Adanite | Pb2(Te4+O3)(SO4) |
7.BD. | Hasanovite | KNa(MoO2)(SO4)2 |
7.BD. | Evanichite | Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl |
7.BD. | Kennygayite | [Pb4O2(OH)2](SO4) |
7.BD.05 | Sulphohalite | Na6(SO4)2FCl |
7.BD.10 | Galeite | Na15(SO4)5F4Cl |
7.BD.10 | Schairerite | Na21(SO4)7ClF6 |
7.BD.15 | Kogarkoite | Na3(SO4)F |
7.BD.20 | Caracolite | Na3Pb2(SO4)3Cl |
7.BD.20 | Cesanite | Na3Ca2(SO4)3(OH) |
7.BD.20 | Aiolosite | Na4Bi(SO4)3Cl |
7.BD.25 | Burkeite | Na6(CO3)(SO4)2 |
7.BD.30 | Hanksite | Na22K(SO4)9(CO3)2Cl |
7.BD.35 | Cannonite | Bi2(SO4)O(OH)2 |
7.BD.40 | Lanarkite | Pb2(SO4)O |
7.BD.45 | Grandreefite | Pb2(SO4)F2 |
7.BD.50 | Itoite | Pb3Ge4+(SO4)2O2(OH)2 |
7.BD.55 | Chiluite | Bi3Te6+Mo6+O10.5 |
7.BD.60 | Hectorfloresite | Na9(SO4)4(IO3) |
7.BD.70 | Sundiusite | Pb10(SO4)O8Cl2 |
Fluorescence of Pseudograndreefite
Not fluorescent
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.
Internet Links for Pseudograndreefite
mindat.org URL:
https://www.mindat.org/min-3298.html
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Please feel free to link to this page.
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References for Pseudograndreefite
Localities for Pseudograndreefite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Min.Rec.: 27: 296. +2 other references |
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Grand Reef Mine, Laurel Canyon, Grand Reef Mountain, Klondyke, Aravaipa Mining District, Graham County, Arizona, USA