Log In
Rudenkoite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Rudenkoite
Formula:
Sr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2O
Colour:
White
Hardness:
1½
Crystal System:
Monoclinic
Name:
Named in honor of Sergey Alexandrovich Rudenko (Сергей Александрович Руденко) (1917-1992), Professor at the St. Petersburg (Leningrad) Mining Institute and an expert in pegmatite mineralogy.
This page provides mineralogical data about Rudenkoite.
Unique Identifiers
Mindat ID:
26665
Long-form identifier:
mindat:1:1:26665:7
IMA Classification of Rudenkoite
Approved
IMA Formula:
Sr3Al3.5Si3.5O10(OH,O)8Cl2·H2O
Approval year:
2003
First published:
2004
Classification of Rudenkoite
9.HA.50
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rudenkoite
Optical Data of Rudenkoite
Type:
Biaxial (+)
RI values:
nα = 1.693(2) nβ = 1.648(2) nγ = 1.665(2)
2V:
Measured: 75° (10), Calculated: 72°
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
Moderate r>v
Optical Extinction:
X = a.
Pleochroism:
Not Visible
Chemistry of Rudenkoite
Mindat Formula:
Sr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2O
Element Weights:
Crystallography of Rudenkoite
Crystal System:
Monoclinic
Cell Parameters:
a = 5.893(5) Å, b = 7.262(5) Å, c = 10.288(8) Å
β = 97.23(3)°
β = 97.23(3)°
Ratio:
a:b:c = 0.811 : 1 : 1.417
Unit Cell V:
436.77 ų (Calculated from Unit Cell)
Comment:
Space group P2/m, P2, or Pm.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.13 Å | (100) |
| 7.23 Å | (30) |
| 5.23 Å | (40) |
| 3.23 Å | (80) |
| 3.12 Å | (30) |
| 2.96 Å | (100) |
| 2.90 Å | (100) |
| 2.79 Å | (40) |
| 2.70 Å | (30) |
| 2.419 Å | (30) |
| 2.313 Å | (30) |
| 2.182 Å | (80) |
| 2.104 Å | (60) |
| 1.988 Å | (50) |
| 1.855 Å | (70) |
| 1.819 Å | (30) |
| 1.689 Å | (40) |
| 1.617 Å | (60) |
| 1.595 Å | (60) |
| 1.456 Å | (60) |
| 1.394 Å | (30) |
| 1.276 Å | (40) |
| 1.255 Å | (50) |
| 1.240 Å | (30) |
| 1.219 Å | (30) |
| 1.145 Å | (40) |
| 1.103 Å | (30) |
Comments:
Emeldzhakskoe phlogopite deposit, Aldan, Sakha, Russia. Data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Rudenkoite
General Appearance of Type Material:
White spheroidal aggregates to 7 mm; aggregates of tiny flexible fibers.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Russian Academy of Science, Moscow, Russia (catalogue no. 3121/1).
Geological Setting of Type Material:
Prehnitized metasomatic pyroxene-scapolite rock. Found in a pseudomorph of prehnite after scapolite.
Associated Minerals at Type Locality:
Synonyms of Rudenkoite
Other Language Names for Rudenkoite
Related Minerals - Strunz-mindat Grouping
| 9.HA. | Shinichengite | Ca5[BSi2O7(OH)2]2 · 6H2O |
| 9.HA. | Kalyuzhnyite-(Ce) | NaKCaSrCeTi(Si8O21)OF(H2O)3 |
| 9.HA. | Moragite | Ca3TiSi2(Al2Si)O14 |
| 9.HA.05 | Ertixiite | Na2Si4O9 |
| 9.HA.10 | Kenyaite | Na2Si22O41(OH)8 · 6H2O |
| 9.HA.20 | Wawayandaite | Ca6Mn2BBe9Si6O23(OH,Cl)15 |
| 9.HA.25 | Magbasite | KBaFe3+Mg7Si8O22(OH)2F6 |
| 9.HA.35 | Demagistrisite | BaCa2Mn3+4(Si3O10)(Si2O7)(OH)4 · 3H2O |
| 9.HA.37 | Donwilhelmsite | CaAl4Si2O11 |
| 9.HA.40 | Kasatkinite | Ba2Ca8B5Si8O32(OH)3 · 6H2O |
| 9.HA.40 | 'Igumnovite' | Ca3Al2[SiO4]2[◻Cl4] |
| 9.HA.42 | Paqueite | Ca3TiSi2(Al,Ti,Si)3O14 |
| 9.HA.42 | Qeltite | Ca3TiSi2(Fe3+2Si)O14 |
| 9.HA.45 | Rippite | K2(Nb,Ti)2(Si4O12)O(O,F) |
| 9.HA.47 | Zagamiite | CaAl2Si3.5O11 |
| 9.HA.50 | 'α-Carnegieite' | NaAlSiO4 |
| 9.HA.52 | 'Atheriastite' | near Ca5MgFeAl6Si8O32 · 5H2O |
| 9.HA.55 | 'Foshallasite' | Ca3[Si2O7] · 3H2O(?) |
| 9.HA.57 | 'Bhreckite' | |
| 9.HA.60 | Nagelschmidtite | Ca7(SiO4)2(PO4)2 |
| 9.HA.65 | Caryochroite | [Na(Sr0.5Ca0.5)Mg]3[Fe3+8Mn(Fe2+0.5◻0.5)]10(Ti2Si12O37)(OH)14(H2O)3 |
| 9.HA.70 | Juanite | Ca10Mg4Al2Si11O39 · 4H2O or near |
| 9.HA.75 | Tacharanite | Ca12Al2Si18O33(OH)36 |
| 9.HA.80 | Oyelite | Ca10Si8B2O29 · 12.5H2O |
| 9.HA.85 | Denisovite | K14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4-x) · 2H2O |
| 9.HA.90 | Tiettaite | K4Na12Fe3+Si16O41(OH)4 · 2H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rudenkoite
mindat.org URL:
https://www.mindat.org/min-26665.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Rudenkoite
Localities for Rudenkoite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Chukanov et al. (2004) +1 other reference |
Quick NavTopAbout RudenkoiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Emeldzhakskoe phlogopite deposit, Aldan, Sakha, Russia