Pachnolite (original) (raw)
A valid IMA mineral species - grandfathered
About PachnoliteHide
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Colour:
Colourless, white; colourless in transmitted light
Crystal System:
Monoclinic
Name:
From the Greek πάχνη, frost, and λίθος, stone, in allusion to its appearance.
This page provides mineralogical data about Pachnolite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3058:4
120e43c3-2adb-4cbc-b7b3-f052d73be5ff
IMA Classification of PachnoliteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaCaAlF6 · H2O
Classification of PachnoliteHide
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3.CB.40
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.5.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.18
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Phn | 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 PachnoliteHide
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Transparency:
Transparent, Translucent
Colour:
Colourless, white; colourless in transmitted light
Cleavage:
Poor/Indistinct
On {001}.
Fracture:
Irregular/Uneven
Density:
2.983 g/cm3 (Measured) 2.97 g/cm3 (Calculated)
Optical Data of PachnoliteHide
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RI values:
_n_α = 1.411 _n_β = 1.413 _n_γ = 1.420
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of PachnoliteHide
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Mindat Formula:
NaCa[AlF6] · H2O
Crystallography of PachnoliteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 12.117(4) Å, b = 10.414(3) Å, c = 15.680(4) Å
β = 90.37(2)°
Ratio:
a:b:c = 1.164 : 1 : 1.506
Unit Cell V:
1,978.56 ų (Calculated from Unit Cell)
Morphology:
Crystals prismatic [001], commonly acutely terminated. Terminated by {001} at times. {110} striated parallel to the intersection with {001}. Massive, cleavale to granular; stalactitic masses.
Twinning:
On {100} common, yielding crystals with an orthorhombic appearance; giving a grid pattern in thin section.
Comment:
Non-standard space-group setting F2/d.
Crystallographic forms of PachnoliteHide
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Crystal Atlas:
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Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005195 | Pachnolite | Hawthorne F C, Ferguson R B (1983) The crystal structure of pachnolite The Canadian Mineralogist 21 561-566 |  |
1983 | 0 | 293 |
CIF Raw Data - click here to close
Epitaxial Relationships of PachnoliteHide
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Epitaxy Comments:
Oriented growths of thomsenolite on pachnolite, with thomsenolite (001) and (110) quasi-parallel to pachnolite (110) and (001). Also with thomsenolite (110) and (110) quasi-parallel to pachnolite (110) and (001).
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.95 Å | (100) |
| 3.26 Å | (10) |
| 3.02 Å | (20) |
| 2.92 Å | (10) |
| 2.79 Å | (70) |
| 2.16 Å | (50) |
| 1.971 Å | (90) |
Geological EnvironmentHide
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Type Occurrence of PachnoliteHide
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Place of Conservation of Type Material:
No designated type material.
Associated Minerals at Type Locality:
Synonyms of PachnoliteHide
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Other Language Names for PachnoliteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Notes:
Readily soluble in H2SO4.
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 PachnoliteHide
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References for PachnoliteHide
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Reference List:
Localities for PachnoliteHide
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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
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- 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.