Dondoellite
A valid IMA mineral species
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About Dondoellite
Don Doell Sr and Jr
Formula:
Ca2Fe(PO4)2 · 2H2O
Colour:
Colorless to pale yellow
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
3.14
Crystal System:
Triclinic
Member of:
Name:
Named after Don Doell Sr. (b. 29 January 1948, Rochester, New York, USA) and Don Doell Jr. (b. 20 July 1982, Montreal, Quebec, Canada), Canadian mineral collectors who provided the first specimens for analysis.
Type Locality:
Dimorph of:
Note: the CNMNC Newsletter reports the type locality as a peak (and not a creek).
"Topologically, the crystal structure of dondoellite can be considered a combination of the collinsite and messelite structures alternating along [001], thus representing a new structure type for minerals with kröhnkite-type chains." (Yang et al., 2022).
Dondoellite falls within the kröhnkite supergroup but not within the kröhnkite, talmessite and fairfieldite groups; it does not (as yet) have any isostructural
minerals and hence cannot form a group, but it is likely that this will happen in due course.
"Topologically, the crystal structure of dondoellite can be considered a combination of the collinsite and messelite structures alternating along [001], thus representing a new structure type for minerals with kröhnkite-type chains." (Yang et al., 2022).
Dondoellite falls within the kröhnkite supergroup but not within the kröhnkite, talmessite and fairfieldite groups; it does not (as yet) have any isostructural
minerals and hence cannot form a group, but it is likely that this will happen in due course.
Unique Identifiers
Mindat ID:
55598
Long-form identifier:
mindat:1:1:55598:6
IMA Classification of Dondoellite
Classification of Dondoellite
8.CG.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ddl | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Dondoellite
Vitreous
Transparency:
Transparent
Colour:
Colorless to pale yellow
Streak:
White
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Parting:
None
Density:
3.14(5) g/cm3 (Measured) 3.15 g/cm3 (Calculated)
Optical Data of Dondoellite
Type:
Biaxial (+)
RI values:
nα = 1.649(5) nβ = 1.654(5) nγ = 1.672(2)
2V:
Measured: 55° (2), Calculated: 58°
Max. Birefringence:
δ = 0.023
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 ”m 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 ”m 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:
Weak, r > v.
Chemistry of Dondoellite
Mindat Formula:
Ca2Fe(PO4)2 · 2H2O
Element Weights:
Crystallography of Dondoellite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.4830(2) Å, b = 5.7431(2) Å, c = 13.0107(5) Å
α = 98.772(2)°, β = 96.209(2)°, γ = 108.452(2)°
α = 98.772(2)°, β = 96.209(2)°, γ = 108.452(2)°
Ratio:
a:b:c = 0.955 : 1 : 2.265
Unit Cell V:
378.71 Ă
Âł (Calculated from Unit Cell)
Z:
2
Morphology:
Spherical aggregates of radiating bladed crystals.
Twinning:
None.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.136 Ă | (35) |
| 3.149 Ă | (100) |
| 3.023 Ă | (63) |
| 2.669 Ă | (100) |
| 2.574 Ă | (30) |
| 2.628 Ă | (26) |
| 1.782 Ă | (25) |
| 1.701 Ă | (25) |
Comments:
Grizzly Bear Creek, Yukon, Canada. Data from the type description.
Type Occurrence of Dondoellite
General Appearance of Type Material:
Spherical aggregates (diameters up to 2 cm) of radiating bladed crystals. Individual crystals are up to 0.80 x 0.10 x 0.03 mm in size.
Place of Conservation of Type Material:
Mineralogical collections of (1) the University of Arizona Mineral Museum, 1040 E 4th Street, Tucson, AZ 85721-0077, USA, catalogue # 22710 (holotype), and (2) the RRUFF Project, deposition # R210003 (cotype).
Geological Setting of Type Material:
Found in fracture fillings in quartz-phosphate veins cutting a sedimentary iron formation with marine phosphorites and shales. Its formation temperature is estimated to range from 50 to 200 °C.
Associated Minerals at Type Locality:
Synonyms of Dondoellite
Other Language Names for Dondoellite
Dutch:Dondoelliet
German:Dondoellit
Relationship of Dondoellite to other Species
Member of:
Other Members of Kröhnkite Supergroup:
| Brandtite Group | ||
| Collinsite Group | ||
| Fairfieldite Group | A group of triclinic phosphates. | Tric. |
Common Associates
Associations Based on Photo Data:
| 6 photos of Dondoellite associated with Lazulite | MgAl2(PO4)2(OH)2 |
| 3 photos of Dondoellite associated with Quartz | SiO2 |
| 2 photos of Dondoellite associated with Whiteite Subgroup | XM1M22M32(H2O)8(OH)2(PO4)4 |
| 1 photo of Dondoellite associated with Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 1 photo of Dondoellite associated with Whiteite-(CaFeMg) | {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O |
| 1 photo of Dondoellite associated with Siderite | FeCO3 |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | 'Ca-Huréaulite' | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
| 8.CG.05 | 'Unnamed (Fe2+-analogue of Parabrandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | 'Unnamed (Fe2+-analogue of Brandtite)' | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
| 8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
| 8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
| 8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Other Information
Notes:
Insoluble in water or hydrochloric acid.
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 Dondoellite
mindat.org URL:
https://www.mindat.org/min-55598.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Dondoellite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2021) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 63. Mineralogical Magazine, 85 (6) 910-915 doi:10.1180/mgm.2021.74
Localities for Dondoellite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Canada (TL) | |
| Miyawaki et al. (2021) +1 other reference |
| Collection of Eddy Vervloet | |
Germany | |
| rruff.info (n.d.) |
Quick NavTopAbout DondoelliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Grizzly Bear Creek, Stoneman Camp, Rapid Creek, Dawson mining district, Yukon, Canada