Caryochroite Mineral Data

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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 (?)

$Help on X Ray Diffraction:$ 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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Caryochroite

(Na,Sr)3(Fe+++,Mg)10[Ti2Si12O37](O,OH)9•8H2O
Dana No: 56.02.06b.06 Strunz No: 09.HA.65
Locality:

Notes: