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 (?)

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

Search for Caryochroite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Caryochroite :

A Bijoux Google Search for Caryochroite
Adam's Minerals Google Search for Caryochroite
Cape Minerals Google Search for Caryochroite
Dakota Matrix Minerals Google Search for Caryochroite
Excalibur Mineral Corp. Google Search for Caryochroite
Exceptional Minerals Google Search for Caryochroite
John Betts Fine Minerals Search for Caryochroite
McDougall Minerals Google Search for Caryochroite
Mineral News Website Link
Rock and Mineral Shows Google Search for Caryochroite
Weinrich Minerals, Inc. Google Search for Caryochroite

Ask about Caryochroite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: