Uvite Mineral Data

Uvite Mineral Data +

General Uvite Information

Chemical Formula:

(Ca,Na)(Mg,Fe++)3Al5Mg(BO3)3Si6O18(OH,F)4

Composition:

Molecular Weight = 970.23 gm

Sodium 0.59 % Na 0.80 % Na₂O

Calcium 3.10 % Ca 4.33 % CaO

Magnesium 5.64 % Mg 9.35 % MgO

Aluminum 13.90 % Al 26.27 % Al₂O₃

Iron 4.32 % Fe 5.55 % FeO

Silicon 17.37 % Si 37.16 % SiO₂

Boron 3.34 % B 10.76 % B₂O₃

Hydrogen 0.31 % H 2.79 % H₂O

Oxygen 49.47 % O

Fluorine 1.96 % F 1.96 % F

- % F -0.82 % -O=F₂

______ ______

100.00 % 98.14 % = TOTAL OXIDE

Empirical Formula:

Ca_0.75Na_0.25Mg_2.25Fe²⁺_0.75Al₅(BO₃)₃Si₆O₁₈(OH)₃F

Environment:

Pegmatitic and skarn rocks.

IMA Status:

Valid Species (Pre-IMA) 1929 (Dana # Changed)

Locality:

Province Uva, Sri Lanka. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 74189

PDF 29-342

Tourmaline

Uvite - (61.3.1.3)

Uvite Image

Images:

Uvite

Comments: Reddish brown, prismatic uvite crystals.
Location: Brumado, Bahia, Brazil. Scale: 4.5 x 5.5 cm.
© Fabre Minerals

Uvite Crystallography

Axial Ratios:

a:c = 1:0.4527

Cell Dimensions:

a = 15.973, c = 7.231, Z = 3; V = 1,597.73 Den(Calc)= 3.02

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): 2.965(1), 2.577(0.9), 2.043(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Help on Above

MacDonald D J , Hawthorne F C , The Canadian Mineralogist , 33 (1995) p.849-858, The crystal chemistry of Si=Al substitution in tourmaline, Sample: T72

View Additional jPOWD Structure files for Uvite
[1] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Uvite

Cleavage:

[1011] Indistinct

Color:

Yellowish brown, Brown, Blackish brown, Bluish black.

Density:

3.1 - 3.2, Average = 3.15

Diaphaniety:

Translucent to opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

7.5 - Garnet

Luminescence:

Piezoelectric.

Luster:

Vitreous - Greasy

Streak:

light brown

Optical Properties of Uvite

Dichroism (e):

light brown.

Dichroism (w):

brown.

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2185,KPDmeas= 0.2095,KC= 0.205

Optical Data:

Uniaxial (-), e=1.65, w=1.67, bire=0.0200.

Calculated Properties of Uvite

Electron Density:

r_electron=3.12 gm/cc
note: r_Uvite=3.15 gm/cc.

Fermion Index

Fermion Index = 0.02159
Boson Index = 0.97841

Photoelectric:

PE_Uvite= 2.92 barns/electron
U=PE_Uvite x r_electron= 9.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Uvite is Not Radioactive

Uvite Classification

Dana Class:

61.3b.1.3 (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.19-90 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 Uvite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Uvite

(Ca,Na)(Mg,Fe++)3Al5Mg(BO3)3Si6O18(OH,F)4
Dana No: 61.3b.1.3 Strunz No: VIII/E.19-90
Locality:

Notes: