UM1985-09-PO:CaFeHMn
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Formula:
(Mn,Fe3+,Fe2+,Mg,Ca,Na)7Ca2(PO4)6
above is the formula from Smith & Nickel (2007/2012); author's formula: (Mn,Fe3+,Fe2+,Na,Ca)7Ca2(PO4)6(OH,H2O)4
Colour:
dark green (when fresh)
Lustre:
Pearly, Dull
Specific Gravity:
3.64
Crystal System:
Orthorhombic
Reported as a wicksite-like phase, possibly representing its Mn analogue. However, it resembles wicksite only in terms of chemistry. Chemically somewhat similar to 'alluaudite-Ca□', beusite, graftonite, hagendorfite, and varulite.
The phase associates with barbosalite, pyrite, and secondary Fe phosphate minerals. It was found as a druse coating on barbosalite. According to the authors its chemical composition may be recast in various forms.
The phase associates with barbosalite, pyrite, and secondary Fe phosphate minerals. It was found as a druse coating on barbosalite. According to the authors its chemical composition may be recast in various forms.
Unique Identifiers
Mindat ID:
47825
Long-form identifier:
mindat:1:1:47825:2
Similar Names
| UM1992-14-PO:CaFeHMn | Valid as an unnamed mineral | ~Ca(Fe,Mn,Mg)4P4O14(OH)2 · 7H2O |
| UM2007-19-PO:CaFeHMg | A synonym of Jahnsite-(CaFeMg) |
Physical Properties of UM1985-09-PO:CaFeHMn
Pearly, Dull
Colour:
Dark green (when fresh)
Comment:
lighter green when altered
Density:
3.64(5) g/cm3 (Measured) 3.766 g/cm3 (Calculated)
Optical Data of UM1985-09-PO:CaFeHMn
Type:
Biaxial (+)
RI values:
nα = 1.781 nβ = 1.787 nγ = 1.796
Max. Birefringence:
δ = 0.015
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
strong (r < v)
Pleochroism:
Strong
Comments:
dark brownish green (X), dark green (Y), medium brownish green (Z)
Comments:
2V=75o; absorption: X > Y > Z
Chemistry of UM1985-09-PO:CaFeHMn
Mindat Formula:
(Mn,Fe3+,Fe2+,Mg,Ca,Na)7Ca2(PO4)6
above is the formula from Smith & Nickel (2007/2012); author's formula: (Mn,Fe3+,Fe2+,Na,Ca)7Ca2(PO4)6(OH,H2O)4
above is the formula from Smith & Nickel (2007/2012); author's formula: (Mn,Fe3+,Fe2+,Na,Ca)7Ca2(PO4)6(OH,H2O)4
Element Weights:
Crystallography of UM1985-09-PO:CaFeHMn
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 12.77(1) Å, b = 12.59(1) Å, c = 11.709(8) Å
Ratio:
a:b:c = 1.014 : 1 : 0.93
Unit Cell V:
1881 ų
Z:
4
Comment:
space group by analogy to wicksite
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.927 Å | (100) |
| 2.769 Å | (100) |
| 2.997 Å | (90) |
| 2.098 Å | (60) |
| 5.84 Å | (50) |
| 6.31 Å | (40) |
| 3.50 Å | (30) |
| 1.665 Å | (30) |
| 4.49 Å | (20) |
| 3.81 Å | (20) |
| 2.484 Å | (20) |
| 1.978 Å | (20) |
| 1.727 Å | (20) |
Other Information
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 UM1985-09-PO:CaFeHMn
mindat.org URL:
https://www.mindat.org/min-47825.html
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Please feel free to link to this page.
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References for UM1985-09-PO:CaFeHMn
Reference List:
Localities for UM1985-09-PO:CaFeHMn
Showing 1 localities.
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The 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).
All localities listed without proper references should be considered as questionable.
USA | |
| Peacor et al. (1985) |
