Rudenkoite Mineral Data

General Rudenkoite Information

Chemical Formula:

Sr3Al3[(Si,Al)4O10](OH,O)8Cl2•H2O

Composition:

Molecular Weight = 877.08 gm

Barium 5.17 % Ba 5.77 % BaO

Strontium 28.17 % Sr 33.32 % SrO

Calcium 0.59 % Ca 0.83 % CaO

Aluminum 10.74 % Al 20.29 % Al₂O₃

Silicon 11.14 % Si 23.84 % SiO₂

Hydrogen 1.09 % H 9.74 % H₂O

Chlorine 8.73 % Cl 8.73 % Cl

- % Cl -1.97 % -O=Cl₂

Oxygen 34.37 % O

______ ______

100.00 % 100.54 % = TOTAL OXIDE

Empirical Formula:

Sr_2.82Ba_0.33Ca_0.13Al_3.49Si_3.48O_10.16(OH)_7.88Cl_2.16·0.8(H₂O)

Environment:

Formed as a metasomatic product of prehnitization and is found in a psuedomorph of prehnite after scapolite.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Emel'dzhaksky phlogopite deposit, Aldan province, Aldan Shield, southern Yakutsk, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Sergey Alexandrovich Rudenko (1917-1992). Professor at the St. Petersburg (Leningrad) Mining Institute.

Synonym:

IMA2003-060

Rudenkoite Image

Images:

Rudenkoite

Comments: White fragment of rudenkoite embedded in epoxy, co-type material.
Location: 80 km SEE of Aldan, Yakutia, Russia. Scale: See Image.
© Rruff Database

Rudenkoite Crystallography

Axial Ratios:

a:b:c =0.8114:1:1.4166

Cell Dimensions:

a = 5.893, b = 7.262, c = 10.288, Z = 1; beta = 97.2° V = 436.80 Den(Calc)= 3.33

Crystal System:

MonoclinicSpace Group: P 2/m, P 2 or Pm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.9(1)(121), 2.96(1)(022), 10.13(1)(001),2.182(0.8)(221), 3.23(0.8)(112), 1.855(0.7)(105), 2.104(0.6)(203),

Physical Properties of Rudenkoite

Cleavage:

{001} Distinct

Color:

White.

Diaphaneity:

Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Rudenkoite

Gladstone-Dale:

CI calc= 0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1954,KC= 0.2097
Ncalc = 1.7

Optical Data:

Biaxial (+), a=1.639, b=1.648, g=1.665, bire=0.0260, 2V(Calc)=74, 2V(Meas)=75. Dispersion r > v medium.

Calculated Properties of Rudenkoite

Electron Density:

Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Rudenkoite =3.33 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Rudenkoite= 54.25 barns/electron
U=PE_Rudenkoite x rElectron Density= 172.69 barns/cc.

Radioactivity:

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

Rudenkoite Classification

Dana Class:

72.01.04.02 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.01)with 4-membered rings

(72.01.04)Dana Group

72.01.04.01 Amstallite CaAl(Si,Al)4O8(OH)4•((H2O),Cl) C 2/c 2/m

72.01.04.02 Rudenkoite! Sr3Al3[(Si,Al)4O10](OH,O)8Cl2•H2O P 2/m, P 2 or Pm Mono

Strunz Class:

09.HA.50 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HA -With alkali and alkali-earth Elements

09.HA.50 Rudenkoite! Sr3Al3[(Si,Al)4O10](OH,O)8Cl2•H2O P 2/m, P 2 or Pm Mono

Other Rudenkoite Information

References:

NAME( AmMin, 90:770) PHYS. PROP.(AmMin, 90:770) OPTIC PROP.(AmMin, 90:770)

See Also:

Links to other databases for Rudenkoite :
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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Print or Cut-and-Paste your Rudenkoite Specimen Label here :

Rudenkoite

Sr3Al3[(Si,Al)4O10](OH,O)8Cl2•H2O
Dana No: 72.01.04.02 Strunz No: 09.HA.50
Locality:

Notes: