Mendeleevite-(Nd)
A valid IMA mineral species
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About Mendeleevite-(Nd)
Post stamp to centenary of Dmitrii Ivanovich Mendeleev
Formula:
Cs6(Nd,REE,Ca)30(Si70O175)(OH,F,H2O)35
The above formula is an ideal one; the simplified formula: (Cs,◻)6(◻,Cs)6(◻,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35
Colour:
Sometimes a pale brown hue
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.20
Crystal System:
Isometric
Name:
Named for its relationship to mendeleevite-(Ce), with predominant neodymium, following the IMA Levinson nomenclature for REE-bearing minerals. The root name honors of Dmitrii Ivanovich Mendeleev (Дмитрий Иванович Менделеев) (8 February 1834, Verkhnie Aremzyani, Tobolsk Governorate, Russian Empire - 2 February 1907, Saint Petersburg, Russian Empire) - the great Russian chemist, the discoverer of the periodic system. Among many honors in his name, the element mendelevium and a large lunar crater are also named after him.
Unique Identifiers
Mindat ID:
46701
Long-form identifier:
mindat:1:1:46701:6
Similar Names
| Mendeleevite (of Vernadsky 1914) | A variety of Pyrochlore Supergroup | |
| Mendeleevite-(Ce) | A valid IMA mineral species | Cs6(Ce,REE,Ca)30(Si70O175)(OH,F,H2O)35 |
IMA Classification of Mendeleevite-(Nd)
Classification of Mendeleevite-(Nd)
9.HG.20
9 : SILICATES (Germanates)
H : Unclassified silicates
G : With REE, Th
9 : SILICATES (Germanates)
H : Unclassified silicates
G : With REE, Th
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 |
|---|---|---|
| Mdl-Nd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Mendeleevite-(Nd)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Mendeleevite-(Nd)
Vitreous
Transparency:
Transparent
Colour:
Sometimes a pale brown hue
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.20 g/cm3 (Measured) 3.155 g/cm3 (Calculated)
Optical Data of Mendeleevite-(Nd)
Type:
Isotropic
RI values:
n = 1.582(2)
Surface Relief:
Moderate
Chemistry of Mendeleevite-(Nd)
Mindat Formula:
Cs6(Nd,REE,Ca)30(Si70O175)(OH,F,H2O)35
The above formula is an ideal one; the simplified formula: (Cs,◻)6(◻,Cs)6(◻,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35
The above formula is an ideal one; the simplified formula: (Cs,◻)6(◻,Cs)6(◻,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35
Element Weights:
Common Impurities:
K,Ce,Sm,Sr,La,Pr,Gd,Eu
Crystallography of Mendeleevite-(Nd)
Crystal System:
Isometric
Class (H-M):
m3(2/m3) - Diploidal
Space Group:
Pm3
Setting:
Pm3
Cell Parameters:
a = 21.9106(4) Å
Unit Cell V:
10,518.72 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.63 Å | (55) |
| 12.73 Å | (40) |
| 11.01 Å | (100) |
| 4.07 Å | (30) |
| 3.47 Å | (42) |
| 3.099 Å | (42) |
| 2.192 Å | (42) |
| 1.819 Å | (41) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Mendeleevite-(Nd)
General Appearance of Type Material:
Cubic crystals (10-40 μm).
Place of Conservation of Type Material:
Type material is deposited in the collections of the A.E. Fersman Mineralogical Museum, Moscow, Russia, registration number 4707/1.
Geological Setting of Type Material:
Pectolite aggregate within silexites.
Associated Minerals at Type Locality:
Synonyms of Mendeleevite-(Nd)
Other Language Names for Mendeleevite-(Nd)
Dutch:Mendeleeviet-(Nd)
German:Mendeleevit-(Nd)
Related Minerals - Strunz-mindat Grouping
| 9.HG.15 | Umbozerite | Na3Sr4Th[Si(O,OH)3-4]8 |
| 9.HG.20 | Rowlandite-(Y) | (Y,Ce)4Fe2+(Si2O7)2F2 (?) |
| 9.HG.20 | Mendeleevite-(Ce) | Cs6(Ce,REE,Ca)30(Si70O175)(OH,F,H2O)35 |
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 Mendeleevite-(Nd)
mindat.org URL:
https://www.mindat.org/min-46701.html
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References for Mendeleevite-(Nd)
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Agakhanov, Atali A., Pautov, Leonid A., Sokolova, Elena, Hawthorne, Frank C., Yu Karpenko, Vladimir, Siidra, Oleg I., Garanin, Viktor K. (2017) Mendeleevite-(Nd), (Cs,□)6(□,Cs)6(□,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35, a new mineral from the Darai-Pioz alkaline massif, Tajikistan. Mineralogical Magazine, 81 (1) 135-141 doi:10.1180/minmag.2016.080.076
Localities for Mendeleevite-(Nd)
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.
Tajikistan (TL) | |
| Hålenius et al. (2015) +1 other reference |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan