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Seamanite

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A. E. Seaman 1858 - 1937, Professor of geology 1899 - 1936
Formula:
Mn2+3[B(OH)4](PO4)(OH)2
Colour:
Yellow, pink, yellow-brown; colourless in transmitted light
Lustre:
Vitreous, Sub-Vitreous
Hardness:
4
Specific Gravity:
3.08
Crystal System:
Orthorhombic
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.
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Classification of SeamaniteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.AC.65

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

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
10.2.4

10 : Borates with other anions
2 : Borates with phosphate or arsenate

Physical Properties of SeamaniteHide

Vitreous, Sub-Vitreous
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:
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {001}.
Density:
3.08 g/cm3 (Measured)    3.13 g/cm3 (Calculated)

Optical Data of SeamaniteHide

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

Formula:
Mn2+3[B(OH)4](PO4)(OH)2
IMA Formula:
Mn2+3B(OH)4(PO4)(OH)2

Crystallography of SeamaniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.81 Å, b = 15.11 Å, c = 6.69 Å
Ratio:
a:b:c = 0.517 : 1 : 0.443
Unit Cell V:
789.48 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals rod-like to acicular [001].
Comment:
Pbnm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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

Type Occurrence of SeamaniteHide

Other Language Names for SeamaniteHide

German:Seamanit
Simplified Chinese:磷硼锰石
Spanish:Seamanita
Traditional Chinese:磷硼錳石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Shigaite5 photos of Seamanite associated with Shigaite on mindat.org.
Triploidite5 photos of Seamanite associated with Triploidite on mindat.org.
Rhodochrosite3 photos of Seamanite associated with Rhodochrosite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.2.1LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
10.2.2CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4
10.2.3TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2OMon.

Fluorescence of SeamaniteHide

Not fluorescent in UV

Other InformationHide

Notes:
Soluble in cold, dilute acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SeamaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 SeamaniteHide

Localities for SeamaniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Australian Jour.Min. v.6, no. 1
USA (TL)
 
  • 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
        • Mineral Hills
          • Homer-Wauseca Group
Travis Olds collection
        • 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
Mineral and/or Locality  
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