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Ramanite-(Rb)
A valid IMA mineral species
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Dr. Chandrasekhara Venkata Raman
Formula:
Rb[B5O6(OH)4] · 2H2O
Specific Gravity:
1.949 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Sir Chandrasekhara Venkata Raman (7 November 1888, Thiruvanaikoil, Tiruchirappalli, Madras Presidency, British India - 21 November 1970, Bangalore, Karnataka, India), physicist. He was awarded the 1930 Nobel Prize for Physics for discovering what is now called Raman scattering. Raman spectroscopy is based on this effect and is now an important tool for mineral identification, and was critical for the discovery of this mineral.
This page provides mineralogical data about Ramanite-(Rb).
Unique Identifiers
Mindat ID:
31662
Long-form identifier:
mindat:1:1:31662:4
Similar Names
| Mamanite | A synonym of Polyhalite | |
| Ramanite-(Cs) | A valid IMA mineral species | Cs[B5O6(OH)4] · 2H2O |
| Riemannite | A synonym of Allophane | |
| Romanit | A synonym of 'Romanite' | |
| Romanite | A synonym of Mianningite | |
| Rumanit | A synonym of Opal | |
| Rumanite | A synonym | |
| Tamanite | A synonym of Anapaite |
IMA Classification of Ramanite-(Rb)
Approved
IMA Formula:
RbB5O6(OH)4·2H2O
Approval year:
2007
First published:
2008
Classification of Ramanite-(Rb)
6.EA.10
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
26.5.2.2
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
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 |
|---|---|---|
| Ram-Rb | 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 Ramanite-(Rb)
Density:
1.949 g/cm3 (Calculated)
Comment:
Based on synthetic material
Chemistry of Ramanite-(Rb)
Mindat Formula:
Rb[B5O6(OH)4] · 2H2O
Element Weights:
Elements listed:
Crystallography of Ramanite-(Rb)
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Aba2
Cell Parameters:
a = 11.304(1) Å, b = 10.963(1) Å, c = 9.337(1) Å
Ratio:
a:b:c = 1.031 : 1 : 0.852
Unit Cell V:
1157.14 ų
Comment:
Based on synthetic material
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020207 | Ramanite-(Rb) | Helmut B (1984) Rubidium pentaborate tetrahydrate, Rb[B5O6(OH)4]*2H2O Locality: synthetic Acta Crystallographica C40 217-220 |  | 1984 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.554 Å | (100) |
| 5.481 Å | (85) |
| 3.391 Å | (63) |
| 2.826 Å | (47) |
| 6.018 Å | (38) |
| 3.329 Å | (38) |
| 2.894 Å | (28) |
| 3.259 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Ramanite-(Rb)
General Appearance of Type Material:
Melt inclusions in graphic quartz
Place of Conservation of Type Material:
Museum of the Mining Academy Freiberg (Germany), catalog no. 81616.
Geological Setting of Type Material:
Pegmatite
Synonyms of Ramanite-(Rb)
Other Language Names for Ramanite-(Rb)
Dutch:Ramaniet-(Rb)
German:Ramanit-(Rb)
Related Minerals - Strunz-mindat Grouping
| 6.EA.05 | Sborgite | Na[B5O6(OH)4] · 3H2O |
| 6.EA.05 | Leucostaurite | Pb2[B5O9]Cl · 0.5H2O |
| 6.EA.10 | Ramanite-(Cs) | Cs[B5O6(OH)4] · 2H2O |
| 6.EA.10 | Santite | K[B5O6(OH)4] · 2H2O |
| 6.EA.15 | Ammonioborite | (NH4)2[B5O6(OH)4]2 · H2O |
| 6.EA.25 | Ulexite | NaCa[B5O6(OH)6] · 5H2O |
Other Information
Notes:
Highly water soluble
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 Ramanite-(Rb)
mindat.org URL:
https://www.mindat.org/min-31662.html
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References for Ramanite-(Rb)
Reference List:
Penin, N.; Seguin, L.; Gérand, B.; Touboul, M.; Nowogrocki, G. (2002) Crystal structure of a new form of Cs[B5O6(OH)4].2H2O and thermal behavior of M[B5O6(OH)4].2H2O (M=Cs, Rb, Tl). Journal of Alloys and Compounds, 334 (1-2). 97-109 doi:10.1016/s0925-8388(01)01768-6
Localities for Ramanite-(Rb)
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.
Italy (TL) | |
| Thomas et al. (2008) |
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