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Denisovite

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About DenisoviteHide

Formula:
K14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2O
Colour:
Gray with greenish tint
Lustre:
Pearly
Hardness:
4 - 5
Crystal System:
Monoclinic
Name:
Named in honor of Alexander Petrovich Denisov (Александра Петровича Денисова) (06 June 1918, Chausy, Tsaritsynsky, Saratov province, Russian SFSR - 31 January 1972, Apatity, USSR), geologist with the Geological Institute, Kola Branch, Acadademy of Science, U.S.S.R. He was an expert in X-ray methods for studying minerals.
The currently accepted formula, K14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2O, places the mineral among the most structurally complex ones.


Classification of DenisoviteHide

Approved
Approval Year:
1982
First Published:
1984
Approval History:
IMA1982-031
9.HA.85

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
65.2.1.7

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
2 : Single-Width Unbranched Chains, W=1 with chains P=3
14.6.4

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both

Physical Properties of DenisoviteHide

Pearly
Colour:
Gray with greenish tint
Comment:
Colorless under microscope
Hardness:
4 - 5 on Mohs scale
Fracture:
Splintery

Optical Data of DenisoviteHide

Type:
Biaxial (+)
RI values:
nα = 1.567 nβ = 1.568 nγ = 1.576
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of DenisoviteHide

Formula:
K14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2O
IMA Formula:
KCa2Si3O8F
Idealised Formula:
K14Ca42Na6[Si60(O,OH)162]F16(O,OH)8·2H2O
Common Impurities:
Ti,Al,Fe,Nb,Mn,Mg,Sr,Ba,Li,Rb,P

Crystallography of DenisoviteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 30.92 Å, b = 7.2 Å, c = 18.27 Å
β = 95°
Ratio:
a:b:c = 4.294 : 1 : 2.538
Unit Cell V:
4,051.86 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.65 (80)
3.32 (100)
3.24 (90)
3.08 (80)
3.03 (90)
2.79 (80)
2.78 (80)
2.75 (100)
2.69 (80)

Type Occurrence of DenisoviteHide

General Appearance of Type Material:
parallel columnar aggregates up to 10-15 cm across, consisting of acicular individuals
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow.
Geological Museum, Apatite.
Reference:
Men´shikov, Y.P. (1984) Denisovite Ca4(K1.4Na0.6)2 Si6O16(F,OH)2 - a new mineral from the Khibina massif. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113(6): 718-723.

Synonyms of DenisoviteHide

Other Language Names for DenisoviteHide

German:Denisovit
Spanish:Denisovita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine5 photos of Denisovite associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.HA.05ErtixiiteNa2Si4O9
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm (2/m 2/m 2/m) : Cmma
9.HA.30AfanasyevaiteCa8[Si2O7]OCl2
9.HA.40IgumnoviteCa3Al2(SiO4)2Cl4Iso.
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.55FoshallasiteCa3[Si2O7] · 3H2O(?)
9.HA.60NagelschmidtiteCa7(SiO4)2(PO4)2Hex. 6 : P61
9.HA.65Caryochroite(Na,Sr)3(Fe3+,Mg)10[(O,OH)9|Ti2Si12O37] · (H2O,O,OH)17Mon.
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or near
9.HA.75TacharaniteCa12Al2Si18O33 (OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OOrth.
9.HA.90Tiettaite(Na,K)17FeTiSi16O29(OH)30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Dana Grouping (8th Ed.)Hide

65.2.1.1bWollastonite-2MCaSiO3Mon.
65.2.1.1cWollastoniteCaSiO3Tric. 1 : P1
65.2.1.1aWollastonite-1ACaSiO3Tric.
65.2.1.2BustamiteCaMn2+(Si2O6)Tric. 1 : P1
65.2.1.3FerrobustamiteCaFe2+(Si2O6)Tric.
65.2.1.4aPectoliteNaCa2Si3O8(OH)Tric. 1 : P1
65.2.1.5SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
65.2.1.6CascanditeCa(Sc,Fe3+)(HSi3O9)Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.6.1CombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
14.6.2PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.5TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2OMon. 2/m : P2/b
14.6.7RhodesiteKHCa2Si8O19 · 5H2OOrth. mmm (2/m 2/m 2/m)
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
14.6.9ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
14.6.10MonticelliteCaMgSiO4Orth.
14.6.11MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
14.6.12DiopsideCaMgSi2O6Mon. 2/m : B2/b
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m

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 DenisoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Men´shikov, Y.P. (1984) Denisovite Ca4(K1.4Na0.6)2 Si6O16(F,OH)2 - a new mineral from the Khibina massif. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113(6): 718-723.
Dunn, P.J., Ferraiolo, J.A., Fleischer, M., Gobel, V., Grice, J.D., Langley, R.H., Shigley, J.E., Vanko, D.A., Zilczer, J.A. (1985) New mineral names. American Mineralogist: 70: 1329-1335.
Konev, A.A., Vorobiev, E.I., Paradina, L.F., Sapozhnikov, A.N. (1987) Denisovite from Murunskii Massif – the 2nd find in the world. Doklady Akademii Nauk SSSR: 293: 196-198.
Rozhdestvenskaya, I.V., Mugnaioli, E., Schowalter, M., Schmidt, M.U., Czank, M., Depmeier, W., Rosenauer, A. (2017): The structure of denisovite, a fibrous nanocrystalline polytypic disordered `very complex' silicate, studied by a synergistic multi-disciplinary approach employing methods of electron crystallography and X-ray powder diffraction. IUCrJ, 4, 223-242

Internet Links for DenisoviteHide

Localities for DenisoviteHide

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
 
  • Eastern-Siberian Region
    • Sakha Republic (Yakutia)
      • Aldan Shield
        • Chara and Tokko Rivers Confluence
[Lapis 1993:4 p.13-20]
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
ZVMO,(1984) 113, 718-723
ZVMO (1984) 113, 718-723; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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