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Calciomurmanite

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About CalciomurmaniteHide

Formula:
(Na,☐)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4
Colour:
pale brownish, purple
Lustre:
Greasy, Pearly
Specific Gravity:
2.70
Crystal System:
Triclinic
Name:
in allusion to calcium content and relation to murmanite
The Na-Ca ordered analogue of murmanite. Chemically related to, e.g., kolskyite.

One of many species based on sheet-structured HOH heteropolyhedral-octahedral blocks. It has three sheets of the following content:

- the O sheet: NaO6 and TiO6 octahedra forming alternating chains
- the H sheets: disilicate groups + TiO6 octahedra + CaO8 polyhedra

Water is located in 2 sites within the interlayer space.


Classification of CalciomurmaniteHide

Approved, Pending publication
Approval Year:
2015

Physical Properties of CalciomurmaniteHide

Greasy, Pearly
Comment:
nacreous on cleavage surfaces, greasy on broken ones across cleavage
Colour:
pale brownish, purple
Streak:
white
Cleavage:
Perfect
(001), micaceous
Fracture:
Step-Like
Density:
2.70(3) g/cm3 (Measured)    2.85 g/cm3 (Calculated)

Optical Data of CalciomurmaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.680(4) nβ = 1.728(4) nγ = 1.743(4)
2V:
Measured: 58° (5)
Max Birefringence:
δ = 0.063
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of CalciomurmaniteHide

Formula:
(Na,☐)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4
IMA Formula:
(Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4
Common Impurities:
Mg,Mn,Fe,Nb,Al

Crystallography of CalciomurmaniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.3470(6) Å, b = 7.0774(7) Å, c = 12.146(1) Å
α = 91.827(4)°, β = 107.527(4)°, γ = 90.155(4)°
Ratio:
a:b:c = 0.756 : 1 : 1.716
Unit Cell V:
438.03 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.69(100)
5.87(68)
4.251(89)
3.825(44)
2.940(47)
2.900(79)
2.752(26)
2.659(39)
Comments:
From Type Description.

Type Occurrence of CalciomurmaniteHide

General Appearance of Type Material:
lamellar crystals, up to 0.1 × 0.4 × 0.6 cm, may form fan-shaped aggregates, up to 3.5 cm
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, catalogue number ST4994; cotype material is deposited in the collections of the Bel’kov Museum of Geology and Mineralogy, Kola
Geological Setting of Type Material:
hydrothermal in hyperagpaitic (peralkaline) rocks, resulting from low-temperature alteration (hydration + cation exchange) of a high-temperature phosphate-bearing titanosilicate precursor (possibly lomonosovite and/or beta-lomonosovite); associated minerals are those at the holotype locality (Flora Mt.)
Associated Minerals at Type Locality:

Synonyms of CalciomurmaniteHide

Common AssociatesHide

AegirineNaFe3+Si2O6
Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2
MicroclineK(AlSi3O8)
Tsepinite-CaCa(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
Tsepinite-KK2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O

Other InformationHide

IR Spectrum:
spectrum is given
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 CalciomurmaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Lykova, I.S., Pekov, I.V., Chukanov, N.V., Belakovskiy, D.I., Yapaskurt, V.O., Zubkova, N.V., Britvin, S.N. and Giester, G. (2015) Calciomurmanite, IMA 2014-103. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine: 79: 529-535.
Lykova, I.S., Pekov, I.V., Chukanov, N.V., Belakovskiy, D.I., Yapaskurt, V.O., Zubkova, N.V., Britvin, S.N., Giester, G. (2016): Calciomurmanite, (Na,□)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4, a new mineral from the Lovozero and Khibiny alkaline complexes, Kola Peninsula, Russia. European Journal of Mineralogy: 28 (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=12750 (2016)

Internet Links for CalciomurmaniteHide

Localities for CalciomurmaniteHide

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.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Lovozero Massif
Pavel M. Kartashov analytical data of 2017, Victor Grishin material
Lykova, I.S., Pekov, I.V., Chukanov, N.V., Belakovskiy, D.I., Yapaskurt, V.O., Zubkova, N.V., Britvin, S.N. and Giester, G. (2015) Calciomurmanite, IMA 2014-103. CNMNC Newsletter No. 25, June 2015, page 530; Mineralogical Magazine, 79, 529-535.
Mineral and/or Locality  
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