Whitmoreite Mineral Data

General Whitmoreite Information

Chemical Formula:

Fe++Fe+++2(PO4)2(OH)2•4(H2O)

Composition:

Molecular Weight = 463.56 gm

Iron 36.14 % Fe 46.50 % FeO

Phosphorus 13.36 % P 30.62 % P₂O₅

Hydrogen 2.17 % H 19.43 % H₂O

Oxygen 48.32 % O

______ ______

100.00 % 96.55 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe²⁺₂(PO₄)₂(OH)₂•4(H₂O)

Environment:

Hydrothermal alteration product of triphylite in cavities in quartz-bearing pegmatite.

IMA Status:

Approved IMA 1974

Locality:

Palermo No. 1 mine, North Groton, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Robert W. Whitmore (1936-), Micromount mineral collector and owner of the Palermo mine, New Hampshire, USA.

Name Pronunciation:

Whitmoreite + Pronunciation

Synonym:

ICSD 6202

PDF 26-1138

Whitmoreite Image

Images:

Whitmoreite

Comments: Two stellate crystal clusters of whitmoreite.
Location: Big Chief mine, Keystone, Penninton County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Whitmoreite Crystallography

Axial Ratios:

a:b:c =1.0277:1:0.5622

Cell Dimensions:

a = 10, b = 9.73, c = 5.471, Z = 2; beta = 93.8° V = 531.16 Den(Calc)= 2.90

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 10.05(1), 4.98(0.7), 7.01(0.7),

Physical Properties of Whitmoreite

Cleavage:

{100} Good

Color:

Brown, Greenish brown, Light yellow brown, Dark brown.

Density:

2.87

Diaphaneity:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Vitreous - Adamantine

Optical Properties of Whitmoreite

Gladstone-Dale:

CI meas= -0.19 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.177 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2467,KPDmeas= 0.2492,KC= 0.2095
Ncalc = 1.6 - 1.61

Optical Data:

Biaxial (-), a=1.676, b=1.725, g=1.745, bire=0.0690, 2V(Calc)=62, 2V(Meas)=60-65.

Pleochroism (x):

light green brown.

Pleochroism (y):

light green brown.

Pleochroism (z):

dark green brown.

Calculated Properties of Whitmoreite

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Whitmoreite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0078973614
Boson Index = 0.9921026386

Photoelectric:

PE_Whitmoreite= 11.30 barns/electron
U=PE_Whitmoreite x rElectron Density= 32.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Whitmoreite is Not Radioactive

Whitmoreite Classification

Dana Class:

42.11.18.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.18)Whitmoreite Group

42.11.18.01 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.02 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

42.11.18.03 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.04 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13•H2O P 2₁/n 2/m

42.11.18.06 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.07 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

42.11.18.08 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Strunz Class:

08.DC.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.15 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

08.DC.15 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Other Whitmoreite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Whitmoreite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Whitmoreite Specimen Label here :

Whitmoreite

Fe++Fe+++2(PO4)2(OH)2•4(H2O)
Dana No: 42.11.18.01 Strunz No: 08.DC.15
Locality:

Notes:

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