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Seamanite

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Formula:
Mn32+[B(OH)4](PO4)(OH)2
System:
Orthorhombic
Colour:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Seamanite

Year of Discovery:
1930
Associated Minerals at First Recorded Locality:

Physical Properties of Seamanite

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:
3.08 g/cm3 (Measured)    3.13 g/cm3 (Calculated)

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 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

Optical Data of Seamanite

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 Seamanite

Formula:
Mn32+[B(OH)4](PO4)(OH)2
Essential elements:
All elements listed in formula:

Relationship of Seamanite to other Species

6.AC.05SinhaliteMgAl(BO4)
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3
6.AC.15Behierite(Ta5+,Nb5+)(BO4)
6.AC.15Schiavinatoite(Nb,Ta)(BO4)
6.AC.20FroloviteCa[B(OH)4]2
6.AC.25HexahydroboriteCa[B(OH)4]2 · 6H2O
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4
6.AC.35BandyliteCu[B(OH)4]Cl
6.AC.40TeepleiteNa2[B(OH)4]Cl
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2O
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2O
6.AC.70CahniteCa2[B(OH)4](AsO4)
10.2.1LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2O
10.2.2CahniteCa2[B(OH)4](AsO4)
10.2.3TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2O

Other Names for Seamanite

Name in Other Languages:
German:Seamanit
Simplified Chinese:磷硼锰石
Spanish:Seamanita
Traditional Chinese:磷硼錳石

Other Information

Not fluorescent in UV
Other Information:
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 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

Localities for Seamanite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
Mineral and/or Locality  
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