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|System:||Orthorhombic||Colour:||Yellow, pink, ...|
|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:||18.104.22.168|
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:|
Physical Properties of Seamanite
|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.|
|Density (measured):||3.08 g/cm3|
|Density (calculated):||3.13 g/cm3|
Crystallography of Seamanite
|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 Å³ (Calculated from Unit Cell)|
|Morphology:||Crystals rod-like to acicular .|
|X-Ray Powder Diffraction:|
Optical Data of Seamanite
|RI values:||nα = 1.640 nβ = 1.663 nγ = 1.665|
|Maximum Birefringence:||δ = 0.025|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Seamanite
|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):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Seamanite
|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
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
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.
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Locality Updated: Fjardará valley, Seyðisfjörður, Eastern Region, IcelandFrom Rob Woodside, 22nd Dec 2014 16:54:36