Trembathite Mineral Data

Trembathite Mineral Data
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General Trembathite Information

Help on Chemical Formula: Chemical Formula: (Mg,Fe++)3B7O13Cl
Help on Composition: Composition: Molecular Weight = 415.69 gm
   Magnesium  13.16 %  Mg   21.82 % MgO
   Iron       10.08 %  Fe   12.96 % FeO
   Boron      18.20 %  B    58.62 % B2O3
   Chlorine    8.53 %  Cl    8.53 % Cl
                -   %   Cl   -1.92 % -O=Cl2   
   Oxygen     50.04 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2.25Fe2+0.75B7O13Cl
Help on Environment: Environment: Component of marine evaporite borate deposits.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Salt Springs evaporite deposit, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lowell T. Trembath (1936-1994), Canadian mineralogist, Professor of Mineralogy, University of New Brunswick, Fredericton, Canada.
Help on Name Pronunciation: Name Pronunciation: Trembathite + Pronunciation Say TREMBATHITE
Help on Synonym: Synonym: ICSD 76897
  IMA1991-018
  PDF 47-1829
 

Trembathite Image

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Trembathite

Comments: Blue-green pseudocubic trembathite crystal.
Location: Salt Springs deposit (Salt Springs evaporite deposit), Sussex, Kings Co., New Brunswick, Canada. Scale: See Image.
© Rruff Database

Trembathite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.44809
Help on Cell Dimensions: Cell Dimensions: a = 8.574, c = 20.99, Z = 6; V = 1,336.32 Den(Calc)= 3.10
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.028(1), 2.05(0.73), 2.711(0.66),
Click Here for Large Trembathite Structure Window Crystal Structure:

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Schindler M , Hawthorne F C , The Canadian Mineralogist , 36 (1998) p.1195-1201, The crystal structure of trembathite, (Mg1.55Fe1.43Mn0.02)B7O13Cl, a mineral of, the boracite group: An example of the insertion of a cluster into a three-dimensional net

 

Physical Properties of Trembathite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Light blue.
Help on Density: Density: 2.84 - 3.34, Average = 3.09
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 6-8
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Trembathite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2181,KPDmeas= 0.2188,KC= 0.221
Ncalc = 1.63 - 1.74
Help on Optical Data: Optical Data: Uniaxial (-), e=1.668, w=1.684, bire=0.0160.
 

Calculated Properties of Trembathite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Trembathite =3.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PETrembathite = 4.05 barns/electron
U=PETrembathite x rElectron Density= 12.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trembathite is Not Radioactive
 

Trembathite Classification
Help on Dana Class: Dana Class: 25.06.02.02 (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.06)Dana Type
  (25.06.02)Boracite Group (Trigonal: R3c)
 
25.06.02.01 Congolite (Fe,Mg,Mn)3B7O13Cl R 3c 3m
 
25.06.02.02 Trembathite (Mg,Fe)3B7O13Cl R 3c 3m
Help on Strunz Class: Strunz Class: 06.GA.10 06 - BORATES
  06.G - Heptaborates and other Megaborates
  06.GA -Tekto-heptaborates
 
06.GA.10 Congolite (Fe,Mg,Mn)3B7O13Cl R 3c 3m
 
06.GA.10 Trembathite (Mg,Fe)3B7O13Cl R 3c 3m
 

Other Trembathite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.78,p233,1993) OPTIC PROP.(Am.Min.,Vol.78,p233,1993)
Help on See Also: See Also: Links to other databases for Trembathite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Trembathite

(Mg,Fe++)3B7O13Cl
Dana No: 25.06.02.02 Strunz No: 06.GA.10
Locality:

 

Notes: