Nobleite Mineral Data

General Nobleite Information

Chemical Formula:

CaB6O9(OH)2•3(H2O)

Composition:

Molecular Weight = 336.99 gm

Calcium 11.89 % Ca 16.64 % CaO

Boron 19.25 % B 61.98 % B₂O₃

Hydrogen 2.39 % H 21.38 % H₂O

Oxygen 66.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB₆O₉(OH)₂•3(H₂O)

IMA Status:

Approved IMA 1961

Locality:

Corkscrew mine, Corkscrew Canyon, Death Valley, Inyo Co. California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Levi F. Noble ( ), Geologist, USGS for his contributions to the geology of the Death Valley region.

Name Pronunciation:

Nobleite

Nobleite Image

Images:

Nobleite

Comments: Platy nobleite microcrystals on colemanite.
Location: Corkscrew Mine, Corkscrew Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nobleite Crystallography

Axial Ratios:

a:b:c =1.8163:1:1.2272

Cell Dimensions:

a = 14.56, b = 8.016, c = 9.838, Z = 4; beta = 111.8° V = 1,066.11 Den(Calc)= 2.10

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 6.79(1), 3.39(0.31), 5.18(0.09),

Crystal Structure:

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Karanovic L , Rosic A , Poleti D , European Journal of Mineralogy , 16 (2004) p.825-833, Crystal structure of nobleite, Ca[B6O9(OH)2]*3H2O, from Jarandol (Serbia), Note: Ca analogue of tunellite, Locality: Kopaonik Mt, central Serbia

Physical Properties of Nobleite

Cleavage:

{100} Perfect, {001} Indistinct

Color:

Colorless, White.

Density:

2.09

Diaphaneity:

Transparent

Fracture:

Flexible - Flexible fragments.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Nobleite

Gladstone-Dale:

CI meas= -0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2498,KPDmeas= 0.251,KC= 0.2409
Ncalc = 1.5 - 1.51

Optical Data:

Biaxial (+), a=1.5, b=1.52, g=1.554, bire=0.0540, 2V(Calc)=78, 2V(Meas)=76.

Calculated Properties of Nobleite

Electron Density:

Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Nobleite =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Nobleite= 1.73 barns/electron
U=PE_Nobleite x rElectron Density= 3.66 barns/cc.

Radioactivity:

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

Nobleite Classification

Dana Class:

26.06.06.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.06)Dana Type

(26.06.06)Dana Group

26.06.06.01 Nobleite CaB6O9(OH)2•3(H2O) P 2₁/a 2/m

26.06.06.02 Tunellite SrB6O9(OH)2•3(H2O) P 2₁/a 2/m

Strunz Class:

06.FC.05 06 - BORATES

06.F - Hexaborates

06.FC -Phyllo-hexaborates

06.FC.05 Balavinskite? Sr2B6O11•4(H2O) Mono ? Mono

06.FC.05 Nobleite CaB6O9(OH)2•3(H2O) P 2₁/a 2/m

06.FC.05 Tunellite SrB6O9(OH)2•3(H2O) P 2₁/a 2/m

Other Nobleite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nobleite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Ask about Nobleite here :
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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 Nobleite Specimen Label here :

Nobleite

CaB6O9(OH)2•3(H2O)
Dana No: 26.06.06.01 Strunz No: 06.FC.05
Locality:

Notes: