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|Name:||Named in 1977 by Paul Brian Moore and Takaharu Araki after Mr. Ewald "The Dutchman" Gerstmann [September 19, 1918 in Bremerhaven, Germany - December 14, 2005, Andover, New Jersey], stationary engineer, mineral dealer, and avid collector of Franklin Mining District minerals. Operator of a private mineral museum and collectors' gathering spot at Franklin, NJ, for many years. The Gerstamaan mineral collection was donated to the Franklin Mineral Museum.|
This page provides mineralogical data about Gerstmannite.
Classification of Gerstmannite
|IMA status:||Approved 1975|
|Strunz 8th edition ID:||8/B.03-20|
|Nickel-Strunz 10th (pending) edition ID:||9.AE.25|
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral  coordination
|Dana 8th edition ID:||22.214.171.124|
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
2 : Insular SiO4 Groups and O, OH, F, and H2O with cations in  and > coordination
|Hey's CIM Ref.:||14.7.21|
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
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Type Occurrence of Gerstmannite
|Type Locality:||Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA|
|Year of Discovery:||1975|
Physical Properties of Gerstmannite
Crystallography of Gerstmannite
|Cell Parameters:||a = 8.18Å, b = 18.65Å, c = 6.25Å|
|Ratio:||a:b:c = 0.439 : 1 : 0.335|
|Unit Cell Volume:||V 953.48 Å³ (Calculated from Unit Cell)|
Optical Data of Gerstmannite
|RI values:||nα = 1.655 nβ = 1.657 nγ = 1.678|
|2V:||Measured: 50° to 60°, Calculated: 36°|
|Maximum Birefringence:||δ = 0.023|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Gerstmannite
|Essential elements:||H, Mg, Mn, O, Si, Zn|
|All elements listed in formula:||H, Mg, Mn, O, Si, Zn|
Relationship of Gerstmannite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Gerstmannite
Display Requirements from:
|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 Gerstmannite
American Mineralogist: 51-59.
Internet Links for Gerstmannite
Localities for Gerstmannite
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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