Trembathite Mineral Data

Trembathite Mineral Data +

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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

IMA Status:

Approved IMA 1992

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 76897

IMA1991-018

PDF 47-1829

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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 PyramidalH-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),

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

Cleavage:

None

Color:

Colorless, Light blue.

Density:

2.84 - 3.34, Average = 3.09

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Trembathite

Electron Density:

r_electron=3.01 gm/cc
note: r_Trembathite=3.09 gm/cc.

Fermion Index

Fermion Index = 0.05175
Boson Index = 0.94825

Photoelectric:

PE_Trembathite= 4.05 barns/electron
U=PE_Trembathite x r_electron= 12.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Trembathite is Not Radioactive

Trembathite Classification

Dana Class:

25.6.2.2 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.6)Dana Type

(25.6.2)Boracite Group (Trigonal: R3c)

25.6.2.1 Congolite (Fe,Mg,Mn)3B7O13Cl R 3c 3m

25.6.2.2 Trembathite (Mg,Fe)3B7O13Cl R 3c 3m

Strunz Class:

V/L.04-35 V - Nitrates, Carbonates and Borates

V/L - Shelly borates with [BO2]1- to [B6O10]2-

V/L.04 - Boracite - Congolite series

V/L.04-10 Boracite Mg3B7O13Cl P ca2₁ mm2

V/L.04-20 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca2₁ mm2

V/L.04-30 Chambersite Mn3B7O13Cl P ca2₁ mm2

V/L.04-35 Trembathite (Mg,Fe)3B7O13Cl R 3c 3m

V/L.04-40 Congolite (Fe,Mg,Mn)3B7O13Cl R 3c 3m

Other Trembathite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Trembathite

(Mg,Fe++)3B7O13Cl
Dana No: 25.6.2.2 Strunz No: V/L.04-35
Locality:

Notes: