Trembathite Mineral Data

General Trembathite Information

Chemical Formula:

(Mg,Fe++)3B7O13Cl

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

Empirical Formula:

Mg_2.25Fe²⁺_0.75B₇O₁₃Cl

Environment:

Component of marine evaporite borate deposits.

IMA Status:

Approved IMA 1992

Locality:

Salt Springs evaporite deposit, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Lowell T. Trembath (1936-1994), Canadian mineralogist, Professor of Mineralogy, University of New Brunswick, Fredericton, Canada.

Name Pronunciation:

Trembathite + Pronunciation

Synonym:

ICSD 76897

IMA1991-018

PDF 47-1829

Trembathite Image

Images:

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

Axial Ratios:

a:c = 1:2.44809

Cell Dimensions:

a = 8.574, c = 20.99, Z = 6; V = 1,336.32 Den(Calc)= 3.10

Crystal System:

Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3c

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

By Intensity(I/I_o): 3.028(1), 2.05(0.73), 2.711(0.66),

Physical Properties of Trembathite

Cleavage:

None

Color:

Colorless, Light blue.

Density:

2.84 - 3.34, Average = 3.09

Diaphaneity:

Transparent

Hardness:

6-8

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Trembathite

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

Optical Data:

Uniaxial (-), e=1.668, w=1.684, bire=0.0160.

Calculated Properties of Trembathite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Trembathite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Trembathite= 4.05 barns/electron
U=PE_Trembathite x rElectron Density= 12.20 barns/cc.

Radioactivity:

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

Trembathite Classification

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

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

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.78,p233,1993) OPTIC PROP.(Am.Min.,Vol.78,p233,1993)

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

Search for Trembathite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Trembathite :

Ask about Trembathite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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 Trembathite Specimen Label here :

Trembathite

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

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.