Krinovite Mineral Data

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.

Name Pronunciation:

Krinovite + Pronunciation

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

Diaphaneity:

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= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2167,KC= 0.1991
Ncalc = 1.67 - 1.69

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:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Krinovite =3.45 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Krinovite= 4.40 barns/electron
U=PE_Krinovite x rElectron Density= 14.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Krinovite is Not Radioactive

Krinovite Classification

Dana Class:

69.02.01a.04 (69)Inosilicate Chains with Side Branches or Loops

(69.02)with P>2

(69.02.01a)Aenigmatite and related species (Aenigmatite subgroup)

69.02.01a.01 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1

69.02.01a.02 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

69.02.01a.03 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

69.02.01a.04 Krinovite NaMg2CrSi3O10 P1 1

69.02.01a.05 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

69.02.01a.06 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

69.02.01a.07 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1

69.02.01a.08 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

69.02.01a.09 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1

Strunz Class:

09.DH.45 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1

09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

09.DH.45 Krinovite NaMg2CrSi3O10 P1 1

09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1

09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 2₁/c 2/m

09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1

09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1

09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

Other Krinovite Information

References:

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

See Also:

Links to other databases for Krinovite :
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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Krinovite Specimen Label here :

Krinovite

NaMg2CrSi3O10
Dana No: 69.02.01a.04 Strunz No: 09.DH.45
Locality:

Notes: