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Trembathite

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About TrembathiteHide

Formula:
(Mg,Fe)3(B7O13)Cl
Atomic proportion of Fe compared to Mg from approximately 0.32 to 0.5.

Colour:
Colourless to pale blue
Lustre:
Vitreous
Hardness:
6 - 8
Crystal System:
Trigonal
Member of:
Name:
Name after Lowell T. Trembath (1936-1994), Professor of Mineralogy, University of New Brunswick, Fredericton, Canada, for his dedication to mineralogical research and teaching.
Dimorph of:
Boracite Group. The magnesium analogue of congolite, always (at standard temperature and pressure) containing some iron, from Mg0.68Fe0.32 to Mg0.5Fe0.5.

Compare with boracite.




Classification of TrembathiteHide

Approved
Approval Year:
1991
6.GA.10

6 : BORATES
G : Heptaborates and other megaborates
A : Tekto-heptaborates
25.6.2.2

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates

Physical Properties of TrembathiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to pale blue
Hardness:
6 - 8 on Mohs scale

Optical Data of TrembathiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.684 nε = 1.668
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of TrembathiteHide

Formula:
(Mg,Fe)3(B7O13)Cl

Atomic proportion of Fe compared to Mg from approximately 0.32 to 0.5.

IMA Formula:
Mg3B7O13Cl
Common Impurities:
Mn,Ca

Crystallography of TrembathiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 8.57 Å, c = 20.99 Å
Ratio:
a:c = 1 : 2.449
Unit Cell V:
1,335.07 ų (Calculated from Unit Cell)

Type Occurrence of TrembathiteHide

Synonyms of TrembathiteHide

Other Language Names for TrembathiteHide

Relationship of Trembathite to other SpeciesHide

Member of:
Other Members of this group:
BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c
EricaiteFe2+3(B7O13)ClOrth.

Related Minerals - Nickel-Strunz GroupingHide

6.GA.05BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
6.GA.05ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
6.GA.05EricaiteFe2+3(B7O13)ClOrth.
6.GA.10Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c
6.GA.30KorzhinskiteCa(B2O4) · H2O

Related Minerals - Dana Grouping (8th Ed.)Hide

25.6.2.1Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TrembathiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
BURNS, P.C., HAWTHORNE, F.C. & STIRLING, J.A.R. (1992): Trembathite, (Mg,Fe)3B7O13Cl, a new borate mineral from the Salt Springs potash deposit, Sussex, New Brunswick. Canadian Mineralogist 30, 445-448. Abstracted in: American Mineralogist (1993): 78: 233.
SCHINDLER, M. & HAWTHORNE, F.C. (1998): 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. Canadian Mineralogist 36, 1195-1201.
ROULSTON, B.V. & WAUGH, D.C.E. (1981): A borate mineral assemblage from Penobsquis and Salt Springs evaporite deposits of southern New Brunswick. Canadian Mineralogist 19, 291-301.
Burns, P.C. and Carpenter, M.A. (1996) Phase transitions in the series boracite-trembathite-congolite: phase relations. Canadian Mineralogist: 34: 881-892.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for TrembathiteHide

Localities for TrembathiteHide

ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Canadian Mineralogist (1996): 34: 657-665.
      • Hammond Parish
        • Salt Springs evaporite deposit
BURNS, P.C., HAWTHORNE, F.C. & STIRLING, J.A.R. (1992): Trembathite, (Mg,Fe)3B7O13Cl, a new borate mineral from the Salt Springs potash deposit, Sussex, New Brunswick. Canadian Mineralogist 30, 445-448. SCHINDLER, M. & HAWTHORNE, F.C. (1998): 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. Canadian Mineralogist 36, 1195-1201.
      • Studholm Parish
Grice, J.D., Gault, R.A., Van Velthuizen, J. (2005) Borate minerals of the Penobsquis and Millstream deposits, southern New Brunswick, Canada. The Canadian Mineralogist: 43: 1469-1487.
Poland
 
  • Wielkopolskie
Wachowiak, J., Pieczka, A. (2016): Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine, 80, 277-289
UK
 
  • England
    • North Yorkshire
      • Redcar and Cleveland
        • Loftus
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003)
Mineral and/or Locality  
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