Ardealite
A valid IMA mineral species - grandfathered
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About Ardealite
Formula:
Ca2(PO3OH)(SO4) · 4H2O
Colour:
Light yellow, yellow, brownish yellow, colourless
Lustre:
Dull, Earthy
Hardness:
1 - 1½
Specific Gravity:
2.30 - 2.34
Crystal System:
Monoclinic
Name:
Named by Josef Schadler and Franz Halla in 1931 for "Ardeal," the old Romanian name for Transylvania, where the type locality is situated.
Type Locality:
A secondary mineral resulting from the breakdown of bat guano in caves in reaction with calcite.
Unique Identifiers
Mindat ID:
321
Long-form identifier:
mindat:1:1:321:6
GUID
(UUID V4):
(UUID V4):
3adb206e-9302-46ae-ae49-12b6e9768120
IMA Classification of Ardealite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1932
Classification of Ardealite
8.CJ.50
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
43.1.1.1
43 : COMPOUND PHOSPHATES, ETC.
1 : Acid Compound Phosphates, etc·
43 : COMPOUND PHOSPHATES, ETC.
1 : Acid Compound Phosphates, etc·
22.3.2
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
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 |
---|---|---|
Adl | 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 Ardealite
Dull, Earthy
Transparency:
Translucent
Comment:
Fine-grained mineral
Colour:
Light yellow, yellow, brownish yellow, colourless
Streak:
Pale yellow
Hardness:
1 - 1½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
2.30 - 2.34 g/cm3 (Measured) 2.32 g/cm3 (Calculated)
Optical Data of Ardealite
Type:
Biaxial (-)
RI values:
nα = 1.531 nβ = 1.539 nγ = 1.546
2V:
Measured: 86°
Birefringence:
0.015
Max Birefringence:
δ = 0.015
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:
Low
Pleochroism:
Non-pleochroic
Chemistry of Ardealite
Mindat Formula:
Ca2(PO3OH)(SO4) · 4H2O
Crystallography of Ardealite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 5.721 Å, b = 30.992 Å, c = 6.25 Å
β = 117.26°
β = 117.26°
Ratio:
a:b:c = 0.185 : 1 : 0.202
Unit Cell V:
985.08 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals very thin platy, minute. Forms thin crusts and fine-grained powdery to clayey masses.
Comment:
Space Group of Cc is based on synthetic material.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000666 | Ardealite | Sakae T, Nagata H, Sudo T (1978) The crystal structure of synthetic calcium phosphate - sulfate hydrate, Ca2HPO4SO4.4H2O, and its relation to brushite and gypsum American Mineralogist 63 520-527 | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.73 Å | (100) |
3.93 Å | (21) |
3.87 Å | (36) |
3.15 Å | (20) |
3.08 Å | (55) |
2.849 Å | (24) |
2.813 Å | (25) |
1.810 Å | (27) |
Comments:
ICDD 41-585
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
52 : Guano- and urine-derived minerals | <0.4 |
Geological Setting:
Limestone caves
Type Occurrence of Ardealite
General Appearance of Type Material:
Fine-grained, earthy to powdery masses.
Place of Conservation of Type Material:
The Natural History Museum, London, England, UK: #1933,87.
Geological Setting of Type Material:
Limestone cave
Associated Minerals at Type Locality:
Reference:
Schadler, J. (1932) Ardealite, ein neues mineral, CaHPO4·CaSO4·4H2O. Centralblatt für Mineralogie, Geologie und Paläontologie: 40-41.
Other Language Names for Ardealite
Related Minerals - Strunz-mindat Grouping
8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
8.CJ. | Caesiumpharmacosiderite | CsFe4[(AsO4)3(OH)4] · 4H2O |
8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
8.CJ.27 | Churchite-(Dy) | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
8.CJ.35 | Fulbrightite | Ca(VO)2(AsO4)2 · 4H2O |
8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
8.CJ.45 | Tristramite | (Ca,U,Fe)(PO4,SO4) · 2H2O |
8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
8.CJ.50 | Churchite-(Nd) | Nd(PO4) · 2H2O |
8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
8.CJ.65 | Sincosite | Ca(VO)2(PO4)2 · 5H2O |
8.CJ.65 | Bariosincosite | Ba(VO)2(PO4)2 · 4H2O |
8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
Other Information
Notes:
Commonly intermixed with Brushite and Gypsum.
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 Ardealite
mindat.org URL:
https://www.mindat.org/min-321.html
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References for Ardealite
Reference List:
Localities for Ardealite
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.
Australia | |
| R Bottrill |
| Podgson RE |
| Helictite 13:19-33 |
Bahamas | |
| Onac B.P. et al. (2001) +1 other reference |
Onac et al. (2001) | |
Bulgaria | |
| Mineralogical Society of America - ... |
| Mineralogical Society of America - ... |
Chile | |
| SEM-EDS by Igor V. Pekov |
France | |
| |
Hungary | |
| Geoda/2007/1 +1 other reference |
Italy | |
| Balenzano et al. (1984) +1 other reference |
| Balenzano et al. (1974) |
| Dell'Anna et al. (1989) |
Dell'Anna et al. (1989) | |
| Audra et al. (2019) |
| Audra et al. (2019) |
Japan | |
| Anthony et al. (2000) |
Malaysia | |
| Bridge et al. (1983) |
Mexico | |
| Forti (2006) |
Namibia | |
| Mineralogical Society of America - ... |
| Mineralogical Society of America - ... |
Romania | |
| Onac et al. (2007) |
| Dumitras D et al. (2004) |
| Zeitschrift für Kristallographie et al. (1931) +3 other references |
| Onac (2009) |
| Marincea et al. (2004) +1 other reference |
| Onac et al. (2003) |
Russia | |
| Sokol et al. (2022) |
Slovakia | |
| Cílek V. |
| Audra et al. (2019) |
South Africa | |
| Cairncross et al. (1995) |
| Miller et al. (2016) |
South Korea | |
| Jun +4 other references |
Spain | |
| B. Onac et al (2009) |
| Onac et al. (2005) |
| Onac et al. (2005) |
| Calvo Rebollar et al. (2022) |
Venezuela | |
| Urbani (1996) |
Franco Urbani (2009) |
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Moorba Cave, Jurien Bay, Dandaragan Shire, Western Australia, Australia