Ramanite-(Rb) Mineral Data

General Ramanite-(Rb) Information

Chemical Formula:

Rb[B5O6(OH)4]•2H2O

Composition:

Molecular Weight = 339.57 gm

Rubidium 25.17 % Rb 27.52 % Rb₂O

Boron 15.92 % B 51.25 % B₂O₃

Hydrogen 2.37 % H 21.22 % H₂O

Oxygen 56.54 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

RbB₅O₆OH₄•2(H₂O)

Environment:

Melt and fluid inclusions in a pegmatite sample from the Island of Elba, Neso-pentaborate identified by Raman spectroscopy.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

San Piero in Campo, Elba, Italy Link to MinDat.org Location Data.

Name Origin:

Named for Chandrasekhara Venkata Raman (1888-1970), Nobel Prize winner in Physics in 1930 for discovering the effect that bears his name.

Synonym:

IMA2007-006

Rubidium pentaborate tetrahydrate

Ramanite-(Rb) Image

Images:

Ramanite-(Rb) Ramanite-(Cs) Santite

Comments: Unheated Type-B melt inclusions in graphic quartz. 1 = ramanite-(Cs), 2 = sassolite, 3 = ramanite-(Rb), 4 = santite, 5 = topaz, V = vapor. (AmMin, v93:1035).
Location: Graphic pegmatite quartz from the Island of Elba, Italy. Scale: Scale Bar 15µm.
© American Mineralogist

Ramanite-(Rb) Crystallography

Axial Ratios:

a:b:c =1.0311:1:0.8516

Cell Dimensions:

a = 11.304, b = 10.963, c = 9.337, Z = 4; V = 1,157.09 Den(Calc)= 1.95

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Aba2

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

By Intensity(I/I_o): 3.554(1), 5.481(0.85), 3.391(0.63),2.826(0.47), 3.329(0.38), 6.018(0.38), 2.894(0.28), 3.259(0.26),

Physical Properties of Ramanite-(Rb)

Color:

Colorless.

Diaphaneity:

Transparent

Habit:

Inclusions - Generally found as inclusions in other minerals.

Optical Properties of Ramanite-(Rb)

Optical Data:

Biaxial (?)

NCalc= 1.42 - from Gladstone-Dale relationship (KC = 0.2176) where Ncalc=Dcalc*KC+1

Calculated Properties of Ramanite-(Rb)

Electron Density:

Bulk Density (Electron Density)=1.91 gm/cc
note: Specific Gravity of Ramanite-(Rb) =1.95 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Ramanite-(Rb)}= 24.91 barns/electron
U=PE_{Ramanite-(Rb)} x r_electron= 47.48 barns/cc.

Radioactivity:

GRapi = 10,440.71 (Gamma Ray American Petroleum Institute Units)
Concentration of Ramanite-(Rb) per GRapi unit = 95.78 (PPM)

Ramanite-(Rb) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Ramanite-(Rb)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 9.93 cm	224,257	6.06E-06	10,440.71	3.43
100 gm / 4.61 cm	22,426	6.06E-07	1,044.07	0.34
10 gm / 2.14 cm	2,243	6.06E-08	104.41	0.03
1 gm / 9.93 mm	224	6.06E-09	10.44	0.00
0.1 gm / 4.61 mm	22	6.06E-10	1.04	0.00
0.01 gm / 2.14 mm	2	6.06E-11	0.10	0.00
0.001 gm / 0.99 mm	0	6.06E-12	0.01	0.00

Weight of pure Ramanite-(Rb) in grams (gm) and Calculated Diameter of a Sphere with a Density of 1.95 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Ramanite-(Rb) Classification

Dana Class:

26.05.02.02 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.02)Santite Group

26.05.02.01 Santite KB5O6(OH)4•2(H2O) Aba2 mm2

26.05.02.02 Ramanite-(Rb)! Rb[B5O6(OH)4]•2H2O Aba2 mm2

26.05.02.03 Ramanite-(Cs)! Cs[B5O6(OH)4]•2H2O C 2/c 2/m

Strunz Class:

06.EA.10 06 - BORATES

06.E - Pentaborates

06.EA -Neso-pentaborates

06.EA.10 Santite KB5O6(OH)4•2(H2O) Aba2 mm2

06.EA.10 Ramanite-(Rb)! Rb[B5O6(OH)4]•2H2O Aba2 mm2

06.EA.10 Ramanite-(Cs)! Cs[B5O6(OH)4]•2H2O C 2/c 2/m

Other Ramanite-(Rb) Information

References:

NAME( AmMin, v93:1034) PHYS. PROP.(AmMin, v93:1034) OPTIC PROP.(AmMin, v93:1034)

See Also:

Links to other databases for Ramanite-(Rb) :
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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Ramanite-(Rb)

Rb[B5O6(OH)4]•2H2O
Dana No: 26.05.02.02 Strunz No: 06.EA.10
Locality:

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