Denisovite Mineral Data

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

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

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

Optical Data:

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

Calculated Properties of Denisovite

Electron Density:

r_electron=2.74 gm/cc
note: r_Denisovite=2.76 gm/cc.

Fermion Index

Fermion Index = 0.01187
Boson Index = 0.98813

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)

Estimated Radioactivity from Denisovite - barely detectable

Denisovite Classification

Dana Class:

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

(65.2)with chains P=3

(65.2.1)Wollastonite group

65.2.1.1a Wollastonite-1A CaSiO3 P1 1

65.2.1.1b Wollastonite-2M* CaSiO3 P 2₁ 2

65.2.1.1c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.2.1.2 Bustamite (Mn,Ca)3Si3O9 P1 1

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

65.2.1.4 Pectolite NaCa2Si3O8(OH) P1 1

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

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

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

Strunz Class:

VIII/F.18-70 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Denisovite Information

References:

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

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Denisovite

(K,Na)Ca2Si3O8(F,OH)
Dana No: 65.2.1.7 Strunz No: VIII/F.18-70
Locality:

Notes: