Mineralogy Database

Denisovite Mineral Data

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General Denisovite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)Ca2Si3O8(F,OH)
Help on Composition: Composition: Molecular Weight = 345.98 gm
   Potassium   8.48 %  K    10.21 % K2O
   Sodium      1.66 %  Na    2.24 % Na2O
   Calcium    23.17 %  Ca   32.42 % CaO
   Silicon    24.35 %  Si   52.10 % SiO2
   Hydrogen    0.07 %  H     0.65 % H2O
   Oxygen     38.15 %  O
   Fluorine    4.12 %  F     4.12 % F
                -   %   F    -1.73 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75Na0.25Ca2Si3O8F0.75(OH)0.25
Help on Environment: Environment: In nepheline syenite in a di´┐Żerentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Mts. Eveslogchorr and Yukspor, Khibiny massif, Kola Peninsula, and in the Murun massif, southwest of Olekminsk, Yakutia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Aleksander Petrovich Denisov (1918-1972), Russian specialist in X-ray investigations of minerals, of the Kola Scientific Center, Russia.
Help on Name Pronunciation: Name Pronunciation: Denisovite + Pronunciation Say DENISOVITE

Denisovite Image

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Comments: Grayish-white fibrous denisovite.
Location: Eveslogchorr Mt , Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Denisovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.2944:1:2.5375
Help on Cell Dimensions: Cell Dimensions: a = 30.92, b = 7.2, c = 18.27, Z = 20; beta = 95° V = 4,051.86 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Monoclinic
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.75(1), 3.32(1), 3.03(0.9),

Physical Properties of Denisovite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Greenish gray, Gray.
Help on Density: Density: 2.76
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Pearly
Help on Streak: Streak: gray white

Optical Properties of Denisovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2008,KPDmeas= 0.2066,KC= 0.2049
Ncalc = 1.57 - 1.58
Help on Optical Data: Optical Data: Biaxial (+), a=1.567, b=1.568, g=1.576, bire=0.0090

Calculated Properties of Denisovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Denisovite =2.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDenisovite = 4.67 barns/electron
U=PEDenisovite x relectron= 12.83 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 121.59 (Gamma Ray American Petroleum Institute Units)
Concentration of Denisovite per GRapi unit = 0.82 (%)

Estimated Radioactivity from Denisovite - barely detectable


Denisovite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.02)with chains P=3
  (65.02.01)Wollastonite group Wollastonite-1A CaSiO3 P1 1 Wollastonite-2M* CaSiO3 P 21 2 Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1 Bustamite (Mn,Ca)3Si3O9 P1 1 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1 Pectolite NaCa2Si3O8(OH) P1 1 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono Tanohataite! LiMn2Si3O8(OH) P1 1
Help on  Strunz Class: Strunz Class: 09.HA.85 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HA -With alkali and alkali-earth Elements
09.HA.85 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

Other Denisovite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Denisovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.HA.85





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