Krinovite Mineral Data

Krinovite Mineral Data +

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General Krinovite Information

Chemical Formula:

NaMg2CrSi3O10

Composition:

Molecular Weight = 367.85 gm

Sodium 6.25 % Na 8.42 % Na₂O

Magnesium 13.21 % Mg 21.91 % MgO

Chromium 14.14 % Cr 18.48 % CrO

Silicon 22.91 % Si 49.00 % SiO₂

Oxygen 43.49 % O

______ ______

100.00 % 97.83 % = TOTAL OXIDE

Empirical Formula:

NaMg₂CrSi₃O₁₀

Environment:

Subhedral grains in graphite nodules in octahedrites.

IMA Status:

Approved IMA 1968

Locality:

Canyon Diablo meteorite, Arizona. Link to MinDat.org Location Data.

Name Origin:

Named for Evgeny Leonidovich Krinov (1906-1984), Russian student of meteorites.

Synonym:

ICSD 67231

PDF 20-1123

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Krinovite Crystallography

Axial Ratios:

a:b:c =0.962:1:0.825

Cell Dimensions:

a = 10.238, b = 10.642, c = 8.78, Z = 4; alpha = 105.5°, beta = 96.5°, gamma = 125.15° V = 748.87 Den(Calc)= 3.26

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.501(1), 2.655(0.9), 2.893(0.8),

Crystal Structure:

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Bonaccorsi E , Merlino S , Pasero M , Zeitschrift fur Kristallographie , 187 (1989) p.133-138, The crystal structure of the meteoritic mineral krinovite, NaNaMg2CrSi3O10, Locality: Wichita County, USA

Physical Properties of Krinovite

Cleavage:

None

Color:

Dark green, Emerald green.

Density:

3.38

Diaphaniety:

Subtranslucent to Opaque

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Subadamantine

Streak:

greenish white

Optical Properties of Krinovite

Gladstone-Dale:

CI meas= -0.088 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.128 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2246,KPDmeas= 0.2167,KC= 0.1991

Optical Data:

Biaxial (+), a=1.712, b=1.725, g=1.76, bire=0.0480, 2V(Calc)=64, 2V(Meas)=61.

Pleochroism (x):

yellow green.

Pleochroism (y):

blue green.

Pleochroism (z):

greenish black.

Calculated Properties of Krinovite

Electron Density:

r_electron=3.33 gm/cc
note: r_Krinovite=3.38 gm/cc.

Fermion Index

Fermion Index = 0.03754
Boson Index = 0.96246

Photoelectric:

PE_Krinovite= 4.40 barns/electron
U=PE_Krinovite x r_electron= 14.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Krinovite is Not Radioactive

Krinovite Classification

Dana Class:

69.2.1a.4 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.1a)Aenigmatite and related species (Aenigmatite subgroup)

69.2.1a.1 Aenigmatite Na2Fe5TiSi6O20 P1 1

69.2.1a.2 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

69.2.1a.3 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

69.2.1a.4 Krinovite NaMg2CrSi3O10 P1 1

69.2.1a.5 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

69.2.1a.6 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

69.2.1a.7 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1

69.2.1a.8 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

69.2.1a.9 IMA2002-009a! Ca2Fe4FeTiSi4BeAlO20 P1 1

Strunz Class:

VIII/F.14-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) modified double chains

VIII/F.14 - Aenigmatite group

VIII/F.14-10 Krinovite NaMg2CrSi3O10 P1 1

VIII/F.14-20 Aenigmatite Na2Fe5TiSi6O20 P1 1

VIII/F.14-30 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

VIII/F.14-35 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

VIII/F.14-40 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

VIII/F.14-50 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

VIII/F.14-60 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

VIII/F.14-70 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1

Other Krinovite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Krinovite

NaMg2CrSi3O10
Dana No: 69.2.1a.4 Strunz No: VIII/F.14-10
Locality:

Notes: