Mineralogy Database

Caryochroite Mineral Data

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General Caryochroite Information

Help on Chemical  Formula: Chemical Formula: (Na,Sr)3(Fe+++,Mg)10[Ti2Si12O37](O,OH)9•8H2O
Help on Composition: Composition: Molecular Weight = 1,968.92 gm
   Potassium   0.52 %  K     0.62 % K2O
   Sodium      1.39 %  Na    1.87 % Na2O
   Strontium   2.76 %  Sr    3.26 % SrO
   Calcium     0.83 %  Ca    1.17 % CaO
   Magnesium   1.42 %  Mg    2.35 % MgO
   Titanium    4.55 %  Ti    7.59 % TiO2
   Manganese   2.34 %  Mn    3.03 % MnO
   Aluminum    0.36 %  Al    0.67 % Al2O3
   Iron       24.08 %  Fe    1.39 % FeO / 32.89 % Fe2O3
   Silicon    16.75 %  Si   35.83 % SiO2
   Hydrogen    1.04 %  H     9.33 % H2O
   Oxygen     43.96 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.19Sr0.62Ca0.41Mn2+0.35K0.26Fe3+7.98Mg1.15Mn2+0.49(Fe2+)0.38Ti1.87Fe3+0.13 Si11.74Al0.26O54.1H20.4
Help on Environment: Environment: Product of supergene alteration (oxidation and dehydration) of a Fe2+-rich protophase locally known as "amorphous greenish grey mineral". Related to nafertisite.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Umbozero mine, Alluaiv, Lovozero, Kola Peninsula, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name is taken from the Greek for (nut) and (color) which recalls its hazel-brown color.
Help on Synonym: Synonym: IMA2005-031

Caryochroite Image

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Comments: Hazel brown aggregate of caryochroite tubes. (CanMin, v44:1331).
Location: Umbozero mine, Alluaiv, Lovozero, Kola Peninsula, Russia. Scale: Specimen size 5 x 6 cm.
© Canadian Mineralogist

Caryochroite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.1057:1:4.5992
Help on Cell Dimensions: Cell Dimensions: a = 16.47, b = 5.303, c = 24.39, Z = 2; beta = 93.5° V = 2,126.26 Den(Calc)= 3.08
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/n (?)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.1(1), 2.923(0.8), 2.968(0.8),13.3(0.3), 14.1(0.2), 2.631(0.13), 2.692(0.12), 4.38(0.1),

Physical Properties of Caryochroite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Hazel brown.
Help on Density: Density: 2.99
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Waxy
Help on Streak: Streak: pale brownish yellow

Optical Properties of Caryochroite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2403,KPDmeas= 0.2475,KC= 0.2663
Ncalc = 1.8 - 1.82
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=1.745, g=1.775, bire=0.0750

Calculated Properties of Caryochroite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Caryochroite =2.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECaryochroite = 12.33 barns/electron
U=PECaryochroite x relectron= 36.22 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7.30 (Gamma Ray American Petroleum Institute Units)
Concentration of Caryochroite per GRapi unit = 13.70 (%)

Estimated Radioactivity from Caryochroite - barely detectable


Caryochroite Classification

Help on  Dana Class: Dana Class: 56.02.06b.06 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)
56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m
56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 21/m 2/m
56.02.06b.03 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m
56.02.06b.04 Surkhobite! KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2
56.02.06b.05 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m
56.02.06b.06 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m
Help on  Strunz Class: Strunz Class: 09.HA.65 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HA -With alkali and alkali-earth Elements
09.HA.65 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m

Other Caryochroite Information

Help on References: References: NAME( CanMin, v44:1331) PHYS. PROP.(CanMin, v44:1331) OPTIC PROP.(CanMin, v44:1331)
Help on See Also: See Also: Links to other databases for Caryochroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 56.02.06b.06 Strunz No: 09.HA.65





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