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|The Zn is tetrahedrally coordinated. The mineral was formerly thought to have the formula (Mn2+,Mg)24Zn4(SiO4)8(AsO4)4(OH)12.|
|System:||Orthorhombic||Colour:||Pale red-brown, deep ...|
|Lustre:||Pearly||Hardness:||3 - 4|
|Name:||Named after Frederick and Alice Kraissl, North Hackensack, New Jersey, avid collectors of Franklin, NJ, minerals, former officers of the Franklin-Ogdensburg Mineralogical Society and generous benefactors to the Franklin Mineral Museum. Frederick Kraissl, Jr. [July 8, 1899 New York, New York, USA - November 30, 1986 River Edge, New jersey, USA] was the son of a Croatian immigrant. He earned his masters degree in chemical engineering at Columbia University, New York in 1922 and his PhD, also from Columbia, for his thesis on "The Mechanics of Colors in Gems and Minerals." He was a Practicing Engineer (PE), specializing in the manufacture of glass. Alice Louise Plenty Kraissl [May 5, 1905 - September 16, 1986 River Edge, New Jersey, USA], earned a bachelors degree in engineering from Barnard College in 1925, and co-founded the family business, Kraissl Associates, with her husband. She was an avid micro-mounter as well.|
This page provides mineralogical data about Kraisslite.
Classification of Kraisslite
|IMA status:||Approved 1977|
|Strunz 8th edition ID:||8/B.11-30|
|Nickel-Strunz 10th (pending) edition ID:||8.BE.45|
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
|Dana 8th edition ID:||220.127.116.11|
43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
|Hey's CIM Ref.:||17.7.11|
17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
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Type Occurrence of Kraisslite
|Type Locality:||Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA|
|General Appearance of Type Material:||Films and lenses to one inch thick|
|Place of Conservation of Type Material:||Smithsonian|
|Year of Discovery:||1977|
|Geological Setting of type material:||1010 Stope central zincite zone|
|Associated Minerals at type locality:|
Physical Properties of Kraisslite
|Colour:||Pale red-brown, deep coppery brown|
|Hardness (Mohs):||3 - 4|
|Density (measured):||3.876 g/cm3|
|Density (calculated):||3.903 g/cm3|
Crystallography of Kraisslite
|Class (H-M):||2 2 2 - Disphenoidal|
|Space Group:||C2 2 21|
|Cell Parameters:||a = 8.1821(1) Å, b = 14.1946(3) Å, c = 43.9103(8) Å|
|Ratio:||a:b:c = 0.576 : 1 : 3.093|
|Unit Cell Volume:||V 5099.8 Å³|
|Comment:||Formerly thought to be hexagonal, a = 8.22, c = 43.88 A.|
Optical Data of Kraisslite
|RI values:||nε = 1.805|
|Maximum Birefringence:||δ = 0.000|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Colour in reflected light:||coppery|
Chemical Properties of Kraisslite
The Zn is tetrahedrally coordinated. The mineral was formerly thought to have the formula (Mn2+,Mg)24Zn4(SiO4)8(AsO4)4(OH)12.
|Simplified for copy/paste:||Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16|
|Essential elements:||As, Fe, H, Mn, O, Si, Zn|
|All elements listed in formula:||Al, As, Fe, H, Mg, Mn, O, Si, Zn|
Relationship of Kraisslite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Kraisslite
|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 Kraisslite
American Mineralogist (1978): 63: 938-940.
American Mineralogist (1980): 65: 957-960.
Cooper, M.A.; Hawthorne, F.C. (2012): The crystal structure of kraisslite, Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16, from the Sterling Hill mine, Ogdensburg, Sussex County, New Jersey, USA. Mineralogical Magazine 76, 2819-2836.
Internet Links for Kraisslite
Localities for Kraisslite
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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