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Trembathite

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Big Photo

Boulby Mine, Loftus, North Yorkshire, England, UK
© Knut Eldjarn

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Formula:
(Mg,Fe)
 
3
(B
 
7
O
 
13
)Cl
System:TrigonalColour:Colourless to pale blue
Hardness:6 - 8
Member of:Boracite Group
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


Boracite Group. The magnesium analogue of Congolite. The trigonal dimorph of Boracite.

Classification of Trembathite

IMA status:Approved 1991
Strunz 8th edition ID:5/L.04-35
Nickel-Strunz 10th (pending) edition ID:6.GA.10

6 : BORATES
G : Heptaborates and other megaborates
A : Tekto-heptaborates
Dana 8th edition ID:25.6.2.2

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
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Type Occurrence of Trembathite

Type Locality:Clover Hill deposit (Cassidy Lake mine; Cassidy Potash mine; Salt Springs deposit; Salt Springs evaporite deposit), Hammond Parish, Kings Co., New Brunswick, Canada
Year of Discovery:1992

Physical Properties of Trembathite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless to pale blue
Hardness (Mohs):6 - 8

Crystallography of Trembathite

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

Optical Data of Trembathite

Type:Uniaxial (-)
RI values: nω = 1.684 nε = 1.668
Maximum Birefringence:δ = 0.016

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Trembathite

Formula:
(Mg,Fe)
 
3
(B
 
7
O
 
13
)Cl
Essential elements:B, Cl, Mg, O
All elements listed in formula:B, Cl, Fe, Mg, O
Common Impurities:Mn,Ca

Relationship of Trembathite to other Species

Member of:Boracite Group
Other Members of Group:

- +
Boracite
Mg
 
3
(B
 
7
O
 
13
)Cl
Chambersite
Mn
2+
3
(B
 
7
O
 
13
)Cl
Congolite
(Fe
2+
 
,Mg)
 
3
(B
 
7
O
 
13
)Cl
Ericaite
Fe
2+
3
(B
 
7
O
 
13
)Cl
Related Minerals - Nickel-Strunz Grouping):

- +
6.GA.05Boracite
Mg
 
3
(B
 
7
O
 
13
)Cl
6.GA.05Chambersite
Mn
2+
3
(B
 
7
O
 
13
)Cl
6.GA.05Ericaite
Fe
2+
3
(B
 
7
O
 
13
)Cl
6.GA.10Congolite
(Fe
2+
 
,Mg)
 
3
(B
 
7
O
 
13
)Cl
6.GA.30Korzhinskite
Ca(B
 
2
O
 
4
) · H
 
2
O

Other Names for Trembathite

Synonyms:
IMA1991-018
Other Languages:
German:Trembathit
Russian:Трембатит
Spanish:Trembathita

Other Information

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

References for Trembathite

Reference List:

- +
Burns, P.C., Hawthorne, F.C., and Stirling, J.A.R. (1992) Trembathite, (Mg,Fe)3B7O13Cl, a new borate mineral from the Salt Springs potash deposit, Sussex, New Brunswick. Canadian Mineralogist (1992): 30: 445-448.

American Mineralogist (1993): 78: 233.

Burns, P.C. and Carpenter, M.A. (1996) Phase transitions in the series boracite-trembathite-congolite: phase relations. Canadian Mineralogist: 34: 881-892.

Schindler, M. and 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 (1998): 36: 1195.

New Minerals (1997), New Minerals 1990-1994.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Trembathite

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    • Localities for Trembathite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • New Brunswick
      • Kings Co.
        • Cardwell Parish
          • Penobsquis
    		Canadian Mineralogist (1996): 34: 657-665.
        • Hammond Parish
    		P.C. Burns, F.C. Hawthorne, J.A.R. Stirling: Can. Mineral. 30:445-448 (1992); Roulston, B.V. and Waugh, D.C.E. (1981) A borate mineal assemblage from the Penobsquis and Salt Springs evaporite deposits of southern New Brunswick. Canadian Mineralogist: 19: 291-301.
        • Studholm Parish
    		Canadian Mineralogist: 43: 1469-1487.
    UK
     
    • England
      • North Yorkshire
        • Loftus
    		J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003)
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