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Mendeleevite-(Nd)

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Post stamp to centenary of Dmitrii Ivanovich Mendeleev
Formula:
Cs6[(Nd,REE)23Ca7](Si70O175)(OH,F)19(H2O)16
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:
To honor Dmitri Mendeleev (1834–1907), famous Russian chemist, author of the periodic table and Nd.
The Nd-analogue of mendeleevite-(Ce). Unique combination of elements; the first Cs-Nd mineral.


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Classification of Mendeleevite-(Nd)Hide

Approved
Approval Year:
2015
First Published:
2017

Pronounciation of Mendeleevite-(Nd)Hide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of Mendeleevite-(Nd)Hide

Vitreous
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)Hide

Type:
Isotropic
RI values:
n = 1.582(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of Mendeleevite-(Nd)Hide

Formula:
Cs6[(Nd,REE)23Ca7](Si70O175)(OH,F)19(H2O)16

The above formula is an ideal one; the simplified formula: (Cs,◻)6(◻,Cs)6(◻,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35
IMA Formula:
Cs6(Nd,REE,Ca)30(Si70O175)(OH,F,H2O)35
Common Impurities:
K,Ce,Sm,Sr,La,Pr,Gd,Eu

Crystallography of Mendeleevite-(Nd)Hide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
15.63(55)
12.73(40)
11.01(100)
4.07(30)
3.47(42)
3.099(42)
2.192(42)
1.819(41)
Comments:
From Type Description.

Type Occurrence of Mendeleevite-(Nd)Hide

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)Hide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mendeleevite-(Nd)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Y., Siidra, O.I. and Garanin, V.K. (2015) Mendeleevite-(Nd), IMA 2015-031. CNMNC Newsletter No. 26, August 2015, page 945; Mineralogical Magazine, 79, 941-947.
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Garanin, V.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: 135–141.

Internet Links for Mendeleevite-(Nd)Hide

Localities for Mendeleevite-(Nd)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tajikistan (TL)
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Y., Siidra, O.I. and Garanin, V.K. (2015) Mendeleevite-(Nd), IMA 2015-031. CNMNC Newsletter No. 26, August 2015, page 945; Mineralogical Magazine, 79, 941-947; Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Garanin, V.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: 135–141.
Mineral and/or Locality  
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