Deynekoite
A valid IMA mineral species - pending publication
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About Deynekoite
Formula:
Ca9◻Fe3+(PO4)7
Colour:
light-yellow and light-brown
Hardness:
4½
Specific Gravity:
3.09 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
The name deynekoite is given in honour of Dr Dina V. Deyneko (born 1988) for her valuable contribution to the investigation of synthetic analogues of merrillite group minerals
A member of the merrillite group of the cerite supergroup. The Fe3+ analogue of the other group members: merrillite, ferromerrillite, keplerite, and matyhite.
Deynekoite is the first mineral of the merrillite group whose composition includes Fe3+, and it has a synthetic analogue.
Deynekoite is the first mineral of the merrillite group whose composition includes Fe3+, and it has a synthetic analogue.
Unique Identifiers
Mindat ID:
55965
Long-form identifier:
mindat:1:1:55965:4
IMA Classification of Deynekoite
Approved, Pending publication
Approval year:
2022
Classification of Deynekoite
8.AD.
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
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 for Standard |
|---|---|---|
| Dnk | 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 Deynekoite
Transparency:
Transparent
Colour:
Light-yellow and light-brown
Streak:
White with a yellowish tint
Hardness:
4½ on Mohs scale
Hardness:
VHN25=319(29) kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.09 g/cm3 (Calculated)
Optical Data of Deynekoite
Type:
Uniaxial (-)
RI values:
nω = 1.658(3) nε = 1.652(3)
Max. Birefringence:
δ = 0.006
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic
Chemistry of Deynekoite
Mindat Formula:
Ca9◻Fe3+(PO4)7
Element Weights:
Elements listed:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Ca8.90Na0.11K0.02)Σ9.03(Fe3+0.62Mg0.30Al0.05)Σ0.97P6.98V5+0.05O27.70(OH)0.30 |
Sample references:
Crystallography of Deynekoite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Cell Parameters:
a = 10.3516(3) Å, c = 37.160(2) Å
Ratio:
a:c = 1 : 3.59
Unit Cell V:
3,448.43 ų (Calculated from Unit Cell)
Z:
6
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.451 Å | (51) |
| 3.433 Å | (25) |
| 3.183 Å | (64) |
| 2.861 Å | (100) |
| 2.737 Å | (24) |
| 2.588 Å | (81) |
| 1.919 Å | (24) |
| 1.716 Å | (28) |
Locality:
Comments:
From Type Description.
Type Occurrence of Deynekoite
General Appearance of Type Material:
aggregates with grains up to 30–40 µm in size
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5791/1
Geological Setting of Type Material:
phosphide-bearing contact facies of diopside-anorthite-tridymite paralava of the Hatrurim Complex in Jordan. Where the phosphides are converting into phosphates.
Associated Minerals at Type Locality:
Synonyms of Deynekoite
Other Language Names for Deynekoite
Dutch:Deynekoiet
German:Deynekoit
Relationship of Deynekoite to other Species
Member of:
Other Members of Merrillite Group:
| Changesite-(Y) | (Ca8Y)◻Fe2+(PO4)7 | Trig. 3m : R3c |
| Merrillite Subgroup | A subgroup with the Merrillite group, which is itself within the greater Cerite Supergroup; new group ... | |
| Whitlockite Subgroup | Group of structurally complex Ca-metal-phosphates. |
Related Minerals - Strunz-mindat Grouping
| 8.AD. | 'Unnamed (Monoclinic polymorph of ximengite)' | Bi(PO4) |
| 8.AD. | Keplerite | Ca9(Ca0.5◻0.5)Mg(PO4)7 |
| 8.AD. | Mazorite | Ba3(PO4)2 |
| 8.AD. | Monazite-(Gd) | Gd(PO4) |
| 8.AD.05 | Nahpoite | Na2(PO3OH) |
| 8.AD.10 | Weilite | Ca(HAsO4) |
| 8.AD.10 | Švenekite | Ca(H2AsO4)2 |
| 8.AD.10 | Monetite | Ca(PO3OH) |
| 8.AD.15 | Archerite | (K,NH4)(H2PO4) |
| 8.AD.15 | Biphosphammite | NH4(H2PO4) |
| 8.AD.20 | Phosphammite | (NH4)2(PO3OH) |
| 8.AD.25 | Buchwaldite | NaCa(PO4) |
| 8.AD.30 | Schulténite | Pb(HAsO4) |
| 8.AD.35 | Dreyerite | Bi(VO4) |
| 8.AD.35 | Wakefieldite-(La) | La(VO4) |
| 8.AD.35 | Anningite-(Ce) | (Ca0.5Ce4+0.5)(VO4) |
| 8.AD.35 | Pretulite | Sc(PO4) |
| 8.AD.35 | Wakefieldite-(Ce) | Ce(VO4) |
| 8.AD.35 | Wakefieldite-(Y) | Y(VO4) |
| 8.AD.35 | Xenotime-(Yb) | Yb(PO4) |
| 8.AD.35 | 'Chernovite-(Ce)' | (Ce,Y)(AsO4) |
| 8.AD.35 | Xenotime-(Gd) | Gd(PO4) |
| 8.AD.35 | Chernovite-(Y) | Y(AsO4) |
| 8.AD.35 | Xenotime-(Y) | Y(PO4) |
| 8.AD.35 | Wakefieldite-(Nd) | Nd(VO4) |
| 8.AD.40 | Pucherite | Bi(VO4) |
| 8.AD.45 | Ximengite | Bi(PO4) |
| 8.AD.50 | 'UM2005-35-VO:CaFePSiTh' | (Th,Ca)(VO4,SiO4,PO4) |
| 8.AD.50 | Rooseveltite | Bi(AsO4) |
| 8.AD.50 | Gasparite-(Ce) | Ce(AsO4) |
| 8.AD.50 | Monazite-(Sm) | Sm(PO4) |
| 8.AD.50 | Monazite-(Ce) | Ce(PO4) |
| 8.AD.50 | Monazite-(La) | La(PO4) |
| 8.AD.50 | Monazite-(Nd) | Nd(PO4) |
| 8.AD.50 | Gasparite-(La) | La(AsO4) |
| 8.AD.50 | Cheralite | CaTh(PO4)2 |
| 8.AD.55 | Tetrarooseveltite | Bi(AsO4) |
| 8.AD.60 | Chursinite | [Hg2]2+Hg2+2[AsO4]2 |
| 8.AD.65 | Clinobisvanite | Bi(VO4) |
| 8.AD.70 | Gurimite | Ba3(VO4)2 |
| 8.AD.75 | Picaite | NaCa[AsO3OH][AsO2(OH)2] |
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 Deynekoite
mindat.org URL:
https://www.mindat.org/min-55965.html
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Please feel free to link to this page.
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References for Deynekoite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 66. European Journal of Mineralogy, 34 (2) 253-257 doi:10.5194/ejm-34-253-2022
Galuskin, Evgeny V., Stachowicz, Marcin, Galuskina, Irina O., Woźniak, Krzysztof, Vapnik, Yevgeny, Murashko, Mikhail N., Zieliński, Grzegorz (2023) Deynekoite, Ca9□Fe3+(PO4)7 – a new mineral of the merrillite group from phosphide-bearing contact facies of paralava, Hatrurim Complex, Daba-Siwaqa, Jordan. Mineralogical Magazine, 87 (6). 943-954 doi:10.1180/mgm.2023.71
Localities for Deynekoite
Showing 1 localities.
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.
Jordan (TL) | |
| Miyawaki et al. (2022) +2 other references |
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Deynekoite type locality, Daba-Siwaqa complex, Transjordan Plateau, Amman Governorate, Jordan