Seamanite Mineral Data

General Seamanite Information

Chemical Formula:

Mn3(PO4)B(OH)6

Composition:

Molecular Weight = 372.64 gm

Manganese 44.23 % Mn 57.11 % MnO

Boron 2.90 % B 9.34 % B₂O₃

Phosphorus 8.31 % P 19.05 % P₂O₅

Hydrogen 1.62 % H 14.50 % H₂O

Oxygen 42.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃(PO₄)B(OH)₆

Environment:

In fractures cutting siliceous rock.

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Chicagoan mine, near Iron River, Iron Co., Michigan, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Professor Arthur Edmund Seaman (1858-1937), American mineralogist, Michigan College of Mining and Technology, Houghton, Michigan, USA

Name Pronunciation:

Seamanite + Pronunciation

Synonym:

ICSD 34850

PDF 25-536

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Seamanite Crystallography

Axial Ratios:

a:b:c =0.5168:1:0.4427

Cell Dimensions:

a = 7.811, b = 15.114, c = 6.691, Z = 4; V = 789.91 Den(Calc)= 3.13

Crystal System:

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

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

By Intensity(I/I_o): 6.917(1), 2.843(0.8), 3.777(0.7),

Forms:

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Forms: ( 1 1 1) ( 1 1 0)

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Crystal Structure:

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Moore P B , Ghose S , American Mineralogist , 56 (1971) p.1527-1538, A novel face-sharing octahedral trimer in the crystal structure of seamanite

View Additional jPOWD Structure files for Seamanite
[1]

Physical Properties of Seamanite

Cleavage:

{???} Indistinct, {001} Distinct

Color:

Yellow, Yellow brown, Light pink, Wine yellow.

Density:

3.13

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Seamanite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KPDmeas= 0.2096,KC= 0.2168
Ncalc = 1.68

Optical Data:

Biaxial (+), a=1.64, b=1.663, g=1.665, bire=0.0250

Calculated Properties of Seamanite

Electron Density:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Seamanite =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.0059813679
Boson Index = 0.9940186321

Photoelectric:

PE_Seamanite= 11.72 barns/electron
U=PE_Seamanite x rElectron Density= 35.64 barns/cc.

Radioactivity:

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

Seamanite Classification

Dana Class:

43.04.05.01 (43)Compound Phosphates, etc.

(43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.04.05)Dana Group

43.04.05.01 Seamanite Mn3(PO4)B(OH)6 Pbnm 2/m 2/m 2/m

Strunz Class:

06.AC.65 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.65 Seamanite Mn3(PO4)B(OH)6 Pbnm 2/m 2/m 2/m

Other Seamanite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Seamanite :
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 Seamanite Specimen Label here :

Seamanite

Mn3(PO4)B(OH)6
Dana No: 43.04.05.01 Strunz No: 06.AC.65
Locality:

Notes: