Denisovite Mineral Data

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General Denisovite Information

Chemical Formula:

(K,Na)Ca2Si3O8(F,OH)

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

Empirical Formula:

K_0.75Na_0.25Ca₂Si₃O₈F_0.75(OH)_0.25

Environment:

In nepheline syenite in a di®erentiated alkalic massif.

IMA Status:

Approved IMA 1984

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.

Name Origin:

Named for Aleksander Petrovich Denisov (1918-1972), Russian specialist in X-ray investigations of minerals, of the Kola Scientific Center, Russia.

Name Pronunciation:

Denisovite + Pronunciation

Denisovite Image

Images:

Denisovite

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

Axial Ratios:

a:b:c =4.2944:1:2.5375

Cell Dimensions:

a = 30.92, b = 7.2, c = 18.27, Z = 20; beta = 95° V = 4,051.86 Den(Calc)= 2.84

Crystal System:

Monoclinic

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.75(1), 3.32(1), 3.03(0.9),

Physical Properties of Denisovite

Cleavage:

{???} Indistinct

Color:

Greenish gray, Gray.

Density:

2.76

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Pearly

Streak:

gray white

Optical Properties of Denisovite

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

Optical Data:

Biaxial (+), a=1.567, b=1.568, g=1.576, bire=0.0090

Calculated Properties of Denisovite

Electron Density:

Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Denisovite =2.76 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Denisovite= 4.67 barns/electron
U=PE_Denisovite x r_electron= 12.83 barns/cc.

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

Dana Class:

65.02.01.07 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.02)with chains P=3

(65.02.01)Wollastonite group

65.02.01.01a Wollastonite-1A CaSiO3 P1 1

65.02.01.01b Wollastonite-2M* CaSiO3 P 2₁ 2

65.02.01.01c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.02.01.02 Bustamite (Mn,Ca)3Si3O9 P1 1

65.02.01.03 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

65.02.01.04 Pectolite NaCa2Si3O8(OH) P1 1

65.02.01.05 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

65.02.01.06 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

65.02.01.07 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

65.02.01.08 Tanohataite! LiMn2Si3O8(OH) P1 1

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Denisovite

(K,Na)Ca2Si3O8(F,OH)
Dana No: 65.02.01.07 Strunz No: 09.HA.85
Locality:

Notes: