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)₂ï¿½4.8(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.

Name Pronunciation:

Earlshannonite + Pronunciation

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 - Prismatic H-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

Diaphaneity:

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= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.075 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2443,KPDmeas= 0.2536,KC= 0.264
Ncalc = 1.77 - 1.79

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:

Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Earlshannonite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0065293234
Boson Index = 0.9934706766

Photoelectric:

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

Radioactivity:

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

Earlshannonite Classification

Dana Class:

42.11.18.04 (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 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 - 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

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

Earlshannonite

(Mn,Fe++)Fe+++2(PO4)2(OH)2•4(H2O)
Dana No: 42.11.18.04 Strunz No: 08.DC.15
Locality:

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