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Seamanite

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Formula:
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
System:OrthorhombicColour:Yellow, pink, ...
Hardness:4
Name:Named in 1930 by Edward Henry Kraus, Arthur Edmund Seaman, and Chester Baker Slawson in honor of Arthur Edmund Seaman [December 29, 1858 Casnovia, Michigan, USA - July 10, 1937 Columbus, Ohio, USA] Professor of Geology and Mineralogy, Michigan College of Mining and Technology, who first drew attention to the mineral.

Classification of Seamanite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/G.11-20
Strunz 9th edition ID:6.AC.25
Nickel-Strunz 10th (pending) edition ID:6.AC.65

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Dana 8th edition ID:43.4.5.1

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:10.2.4

10 : Borates with other anions
2 : Borates with phosphate or arsenate
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Type Occurrence of Seamanite

Type Locality:Chicagon mine, Menominee iron range, Iron Co., Michigan, USA
Year of Discovery:1930
Associated Minerals at type locality:
SussexiteShigaiteCalcite

Physical Properties of Seamanite

Lustre:Vitreous, Sub-Vitreous
Diaphaneity (Transparency):Transparent
Colour:Yellow, pink, yellow-brown; colourless in transmitted light
Comment:May show the alexandrite effect. May be rosey pink in incandescent light and tan to golden brown in daylight.
Streak:White
Hardness (Mohs):4
Tenacity:Brittle
Cleavage:Distinct/Good
On {001}.
Density (measured):3.08 g/cm3
Density (calculated):3.13 g/cm3

Crystallography of Seamanite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 7.81Å, b = 15.11Å, c = 6.69Å
Ratio:a:b:c = 0.517 : 1 : 0.443
Unit Cell Volume:V 789.48 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals rod-like to acicular [001].
Comment:Pbnm
X-Ray Powder Diffraction:
d-spacingIntensity
7.55 (60)
6.92 (100)
4.20 (60)
3.78 (70)
3.47 (60)
2.84 (80)
2.50 (70)
2.39 (60)
Comments:ICDD 25-536

Optical Data of Seamanite

Type:Biaxial (+)
RI values: nα = 1.640 nβ = 1.663 nγ = 1.665
2V:Measured: 40°
Birefringence:0.025
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r
Optical Extinction:Parallel
Pleochroism:Non-pleochroic

Chemical Properties of Seamanite

Formula:
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
Simplified for copy/paste:Mn2+3[B(OH)4](PO4)(OH)2
Essential elements:B, H, Mn, O, P
All elements listed in formula:B, H, Mn, O, P

Relationship of Seamanite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
6.AC.15Schiavinatoite
(Nb,Ta)(BO
 
4
)
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
· 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.35Bandylite
Cu[B(OH)
 
4
]Cl
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.45Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
6.AC.50Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
· 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
· 6H
 
2
O
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
10.2.1Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
· 6H
 
2
O
10.2.2Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
10.2.3Teruggite
Ca
 
4
Mg[AsO
 
4
|B
 
6
O
 
7
(OH)
 
6
]
 
2
· 12H
 
2
O

Other Names for Seamanite

Other Languages:
German:Seamanit
Russian:Симанит
Simplified Chinese:磷硼锰石
Spanish:Seamanita
Traditional Chinese:磷硼錳石

Other Information

Fluorescence in UV light:Not fluorescent in UV
Other Information:Soluble in cold, dilute acids.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Seamanite

Reference List:

- +
Kraus, Edward Henry, Seaman, Arthur Edmund, and Slawson, Chester Baker (1930) Seamanite, a new manganese phospho-borale from Iron County, Michigan. American Mineralogist: 15: 220-225.
McConnell, Duncan and Pondrom, Walter L. Jr. (1941) X-ray Crystallography of Seamanite, American Mineralogist: 26: 446-447.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 388-389.
American Mineralogist (1971): 56: 1527-1538.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Seamanite

Search Engines:
  • Look for Seamanite on Google
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  • External Links:
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  • Look for Seamanite on Athena Mineralogy
  • Look for Seamanite on Wikipedia
  • Look for Seamanite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Seamanite details from Handbook of Mineralogy (PDF)
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  • Localities for Seamanite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • South Australia
      • Eyre Peninsula
        • Middleback Range
          • Iron Knob
    Australian Jour.Min. v.6, no. 1
    USA
     
    • Michigan
      • Iron Co.
        • Menominee iron range
    Palache et al (1951), Dana's System of Mineralogy, seventh ed., vol. II: 376, 389.; Kraus, Seaman, and Slawson (1930) American Mineralogist: 15: 220-225
          • Stambaugh
    Mineralogy of Michigan (2004) Heinrich & Robinson
    Mineralogy of Michigan (2004) Heinrich & Robinson
      • Marquette Co.
        • Marquette iron range
          • Negaunee
    Mineralogy of Michigan (2004) Heinrich & Robinson
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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