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UM1963-02-PO:AlCaH
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Formula:
CaAl3(PO4)2(OH)5 · H2O
The original paper formula: (Ca,Sr,Pb)2Al7(OH)16(PO4)3•3H2O
Colour:
Buff yellow
Lustre:
Waxy
Hardness:
3
Crystal System:
Triclinic
Possibly a triclinic polymorph of crandallite, from a forest at Bajo de Santa Fé forest, El Petén, Guatemala. Interestingly, crandallite is reported from this department.
Chemically similar to 'cirrolite', gatumbaite, foggite.
Found 3 m below a seasonal swamp forest, within decayed roots; also dispersed within clayey sediments. Forms grains; as powdery material; also small masses, up to 5 mm, no crystal faces recognizable. Associated with gypsum. Biogeochemical genesis suggested (decay of roots of Melanostomaceae).
Chemically similar to 'cirrolite', gatumbaite, foggite.
Found 3 m below a seasonal swamp forest, within decayed roots; also dispersed within clayey sediments. Forms grains; as powdery material; also small masses, up to 5 mm, no crystal faces recognizable. Associated with gypsum. Biogeochemical genesis suggested (decay of roots of Melanostomaceae).
Unique Identifiers
Mindat ID:
47115
Long-form identifier:
mindat:1:1:47115:2
Similar Names
| UM1977-02-CO:AlCaH | Ca6Al2(CO3)3O6 · 32H2O | |
| UM1977-08-O:AlCaH | Ca2Al2O5 · nH2O | |
| UM1977-09-O:AlCaH | Ca4Al2O7 · nH2O |
Physical Properties of UM1963-02-PO:AlCaH
Optical Data of UM1963-02-PO:AlCaH
Type:
Biaxial (+)
RI values:
nα = 1.602(2) nβ = 1.607(2) nγ = 1.615(5)
2V:
Measured: 70° to 75°
Max. Birefringence:
δ = 0.013
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
Chemistry of UM1963-02-PO:AlCaH
Mindat Formula:
CaAl3(PO4)2(OH)5 · H2O
The original paper formula: (Ca,Sr,Pb)2Al7(OH)16(PO4)3•3H2O
The original paper formula: (Ca,Sr,Pb)2Al7(OH)16(PO4)3•3H2O
Element Weights:
Common Impurities:
Sr,Pb,REE
Crystallography of UM1963-02-PO:AlCaH
Crystal System:
Triclinic
Cell Parameters:
a = 7.010 Å, b = 9.819 Å, c = 9.697 Å
α = 103.1667°, β = 91.2333°, γ = 90.5667°
α = 103.1667°, β = 91.2333°, γ = 90.5667°
Ratio:
a:b:c = 0.714 : 1 : 0.988
Unit Cell V:
649.68 ų (Calculated from Unit Cell)
Twinning:
multiple
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|
Comments:
intensities not given; pattern similar to that of alunite-crandallite series, but lacking the essential 4.8 peak
Other Information
Thermal Behaviour:
T < 350oC: loss of 3 water molecules, no structural change; ~350oC: lattice collapse, with white amorphous material remaining; T > 900oC: crystallization of the amorphous material
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 UM1963-02-PO:AlCaH
mindat.org URL:
https://www.mindat.org/min-47115.html
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References for UM1963-02-PO:AlCaH
Localities for UM1963-02-PO:AlCaH
symbol to view information about a locality.
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.
Guatemala | |
| Hutchinson et al. (1963) |
