Earlshannonite Mineral Data

Earlshannonite Mineral Data +

General Earlshannonite Information

Chemical Formula:

(Mn,Fe++)Fe+++2(PO4)2(OH)2·4(H2O)

Composition:

Molecular Weight = 472.79 gm

Calcium 0.85 % Ca 1.19 % CaO

Magnesium 0.51 % Mg 0.85 % MgO

Manganese 5.81 % Mn 7.50 % MnO

Iron 27.17 % Fe 4.56 % FeO / 33.78 % Fe₂O₃

Phosphorus 13.10 % P 30.02 % P₂O₅

Hydrogen 2.47 % H 22.10 % H₂O

Oxygen 50.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.5Fe²⁺_0.3Mg_0.1Ca_0.1Fe³⁺₂(PO₄)₂(OH)₂·4.8(H₂O)

Environment:

Very late-stage secondary mineral in a lithium-rich granite pegmatite.

IMA Status:

Approved IMA 1984

Locality:

Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Earl V. Shannon (1895-1981), American mineralogist and chemist, U. S. National Museum, Washington, D.C., USA.

Earlshannonite Image

Images:

Earlshannonite

Comments: Brownish earlshonnonite aggregate surrounded by white, pegmatitic matrix.
Location: Foote Mine, Kings Mtn, North Carolina, USA. Scale: 2 1/2" x 2".
© Chris Wright / Wrights Rock Shop

Earlshannonite Crystallography

Axial Ratios:

a:b:c =1.0249:1:0.5641

Cell Dimensions:

a = 9.91, b = 9.669, c = 5.455, Z = 2; beta = 93.95° V = 521.46 Den(Calc)= 3.01

Crystal System:

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

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

By Intensity(I/I_o): 9.8(1), 6.9(0.8), 2.79(0.7),

Physical Properties of Earlshannonite

Cleavage:

[???] Good, [???] Good

Color:

Yellow, Reddish brown.

Density:

2.9

Diaphaniety:

Transparent to Translucent

Fracture:

Even - Flat surfaces (not cleavage) fractured in an even pattern.

Habit:

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

Habit:

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

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Earlshannonite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2443,KPDmeas= 0.2536,KC= 0.2555

Optical Data:

Biaxial (-), a=1.696, b=1.745, g=1.765, bire=0.0690, 2V(Calc)=62, 2V(Meas)=64.

Pleochroism (x):

light yellow.

Pleochroism (y):

light yellow.

Pleochroism (z):

yellow brown.

Calculated Properties of Earlshannonite

Electron Density:

r_electron=2.89 gm/cc
note: r_{Earlshannonite}=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00652
Boson Index = 0.99348

Photoelectric:

PE_{Earlshannonite}= 10.19 barns/electron
U=PE_{Earlshannonite} x r_electron= 29.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Earlshannonite is Not Radioactive

Earlshannonite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.18)Dana Group

42.11.18.1 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

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

42.11.18.3 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

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

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

42.11.18.6 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/D.08-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.08 - Arthurite group

VII/D.08-10 Kleemanite ZnAl2(PO4)2(OH)2·3(H2O) P 2, P 2₁, P 2/m or P 2₁/m Mono

VII/D.08-20 Whitmoreite FeFe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-30 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-40 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-45 Cobaltarthurite! CoFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-50 Ojuelaite ZnFe2(AsO4)2(OH)2·4(H2O) P 2₁/c 2/m

VII/D.08-60 Mapimite Zn2Fe3(AsO4)3(OH)4·10(H2O) Cm m

Other Earlshannonite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Earlshannonite :
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 -École des Mines de Paris

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Earlshannonite

(Mn,Fe++)Fe+++2(PO4)2(OH)2·4(H2O)
Dana No: 42.11.18.4 Strunz No: VII/D.08-30
Locality:

Notes: