Feruvite Mineral Data

Feruvite Mineral Data +

General Feruvite Information

Chemical Formula:

(Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4

Composition:

Molecular Weight = 1,047.92 gm

Sodium 0.55 % Na 0.74 % Na₂O

Calcium 2.87 % Ca 4.01 % CaO

Magnesium 6.26 % Mg 10.38 % MgO

Titanium 1.37 % Ti 2.29 % TiO₂

Aluminum 9.27 % Al 17.51 % Al₂O₃

Iron 12.79 % Fe 16.45 % FeO

Silicon 16.08 % Si 34.40 % SiO₂

Boron 3.09 % B 9.97 % B₂O₃

Hydrogen 0.38 % H 3.44 % H₂O

Oxygen 47.33 % O

______ ______

100.00 % 99.20 % = TOTAL OXIDE

Empirical Formula:

Ca_0.75Na_0.25Fe²⁺_2.4Mg_2.7Ti_0.3Al_3.6(BO₃)₃Si₆O₁₈(OH)₄

Environment:

Hydrothermally altered pegmatitic quartz veins.

IMA Status:

Approved IMA 1989 (Dana # Changed)

Locality:

Cuvier Island, New Zealand. Link to MinDat.org Location Data.

Name Origin:

Named for the iron content and relationship to uvite.

Synonym:

Feruvite - (61.3.1.4)

ICSD 203073

PDF 46-1385

Tourmaline

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Feruvite Crystallography

Axial Ratios:

a:c = 1:0.45247

Cell Dimensions:

a = 16.012, c = 7.245, Z = 3; V = 1,608.65 Den(Calc)= 3.24

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.586(1), 2.979(0.8), 4.24(0.6),

Crystal Structure:

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Grice J D , Robinson G W , The Canadian Mineralogist , 27 (1989) p.199-203, Feruvite, a new member of the tourmaline group, and its crystal structure

Physical Properties of Feruvite

Cleavage:

None

Color:

Brownish black, Dark brown, Black.

Density:

3.207

Diaphaniety:

Translucent to Opaque

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

7 - Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Streak:

gray

Optical Properties of Feruvite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.2114,KC= 0.2114

Optical Data:

Uniaxial (-), e=1.669, w=1.687, bire=0.0180.

Calculated Properties of Feruvite

Electron Density:

r_electron=3.16 gm/cc
note: r_Feruvite=3.21 gm/cc.

Fermion Index

Fermion Index = 0.02468
Boson Index = 0.97532

Photoelectric:

PE_Feruvite= 5.43 barns/electron
U=PE_Feruvite x r_electron= 17.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Feruvite is Not Radioactive

Feruvite Classification

Dana Class:

61.3b.1.4 (61)Cyclosilicate Six-Membered Rings

(61.3b)with borate groups (Calcic Tourmaline Subgroup)

(61.3b.1)Dana Group

61.3b.1.2 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

61.3b.1.3 Uvite! (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

61.3b.1.4 Feruvite ! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

61.3b.1.5 IMA2000-030! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m

Strunz Class:

VIII/E.19-100 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.19 - Tourmaline group

VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m

VIII/E.19-70 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m

VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

VIII/E.19-100 Feruvite (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

Other Feruvite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p707,1990) OPTIC PROP.(Am.Min.,Vol.75,p707,1990)

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Feruvite

(Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4
Dana No: 61.3b.1.4 Strunz No: VIII/E.19-100
Locality:

Notes: