Warwickite Mineral Data

Warwickite Mineral Data +

General Warwickite Information

Chemical Formula:

Mg(Ti,Fe+++,Al)(BO3)O

Composition:

Molecular Weight = 147.29 gm

Magnesium 16.50 % Mg 27.36 % MgO

Titanium 19.50 % Ti 32.54 % TiO₂

Aluminum 1.83 % Al 3.46 % Al₂O₃

Iron 11.37 % Fe 16.26 % Fe₂O₃

Boron 7.34 % B 23.63 % B₂O₃

Oxygen 43.45 % O

______ ______

100.00 % 103.26 % = TOTAL OXIDE

Empirical Formula:

MgTi_0.6Fe³⁺_0.3Al_0.1(BO₃)O

IMA Status:

Valid Species (Pre-IMA) 1838

Locality:

Southwest of Edenville, in the town of Warwick, Orange Co., New York. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 8130

PDF 19-775

Warwickite Image

Images:

Warwickite Chondrodite

Comments: Black crystalline warwickite with tan chondrodite in white marble.
Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Warwickite Crystallography

Axial Ratios:

a:b:c =0.9827:1:0.3296

Cell Dimensions:

a = 9.197, b = 9.358, c = 3.085, Z = 4; V = 265.51 Den(Calc)= 3.68

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 2.58(1), 1.5(0.5), 1.6(0.5),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 59 (1974) p.985-1004

View Additional jPOWD Structure files for Warwickite
[1] [2] [3] [4] [5] [6] [7]

Physical Properties of Warwickite

Cleavage:

[100] Perfect

Color:

Brown, Black.

Density:

3.36

Diaphaniety:

Transparent to Subtranslucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

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

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Streak:

bluish black

Optical Properties of Warwickite

Gladstone-Dale:

CI meas= 0.169 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.241 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2215,KPDmeas= 0.2426,KC= 0.2918

Optical Data:

Biaxial (+), a=1.806, b=1.809, g=1.83, bire=0.0240

Calculated Properties of Warwickite

Electron Density:

r_electron=3.25 gm/cc
note: r_Warwickite=3.36 gm/cc.

Fermion Index

Fermion Index = 0.05894
Boson Index = 0.94106

Photoelectric:

PE_Warwickite= 7.12 barns/electron
U=PE_Warwickite x r_electron= 23.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Warwickite is Not Radioactive

Warwickite Classification

Dana Class:

24.2.2.1 (24)Borates - Anhydrous

(24.2)where (A)2 BO2 [XO3]

(24.2.2)Dana Group

24.2.2.1 Warwickite Mg(Ti,Fe,Al)(BO3)O Pnam 2/m 2/m 2/m

24.2.2.2 Yuanfuliite (Mg,Fe)(Fe,Al,Mg,Ti,Fe)(BO3)O Pnam 2/m 2/m 2/m

Strunz Class:

V/G.03-10 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.03 - Warwickite - Hulsite series

V/G.03-05 Pertsevite! Mg2(BO3)F P na2₁ mm2

V/G.03-10 Warwickite Mg(Ti,Fe,Al)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-15 Yuanfuliite (Mg,Fe)(Fe,Al,Mg,Ti,Fe)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-20 Pinakiolite Mg2MnO2(BO3) C 2/m 2/m

V/G.03-25 Alumino-magnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

V/G.03-30 Magnesiohulsite (Mg,Fe)2(Mg,Fe,Sn)O2(BO3) P 2/m 2/m

V/G.03-40 Hulsite (Fe,Mg)2(Fe,Sn)O2(BO3) P 2/m 2/m

Other Warwickite Information

References:

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

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Warwickite

Mg(Ti,Fe+++,Al)(BO3)O
Dana No: 24.2.2.1 Strunz No: V/G.03-10
Locality:

Notes: