Caryochroite Mineral Data

General Caryochroite Information

Chemical Formula: (Na,Sr)3(Fe+++,Mg)10[Ti2Si12O37](O,OH)9•8H2O 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 Empirical Formula: Na_1.19Sr_0.62Ca_0.41Mn²⁺_0.35K_0.26Fe³⁺_7.98Mg_1.15Mn²⁺_0.49(Fe²⁺)_0.38Ti_1.87Fe³⁺_0.13 Si_11.74Al_0.26O_54.1H_20.4 Environment: Product of supergene alteration (oxidation and dehydration) of a Fe2+-rich protophase locally known as "amorphous greenish grey mineral". Related to nafertisite. IMA Status: Approved IMA 2005 (Dana # Added) Locality: Umbozero mine, Alluaiv, Lovozero, Kola Peninsula, Russia Link to MinDat.org Location Data. Name Origin: The name is taken from the Greek for (nut) and (color) which recalls its hazel-brown color. Synonym: IMA2005-031  

Caryochroite Image

Images:

Caryochroite 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

Axial Ratios: a:b:c =3.1057:1:4.5992 Cell Dimensions: a = 16.47, b = 5.303, c = 24.39, Z = 2; beta = 93.5° V = 2,126.26 Den(Calc)= 3.08 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/n (?) X Ray Diffraction: By Intensity(I/I_o): 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

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

Optical Properties of Caryochroite

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 Optical Data: Biaxial (-), a=1.7, b=1.745, g=1.775, bire=0.0750  

Calculated Properties of Caryochroite

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

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

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

References: NAME( CanMin, v44:1331) PHYS. PROP.(CanMin, v44:1331) OPTIC PROP.(CanMin, v44:1331) 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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