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|Name:||Named in 1966 by Clifford Frondel and Jun Ito in honor of Sterling Brown Hendricks [April 13, 1902 Elysian Fields, Texas, USA - January 4, 1981 Novato, California, USA], American crystallographer, chemist, plant physiology, plant nutrition, and soil chemistry scientist. Hendricks was a pioneer in X-ray and electron diffraction technology. He was an accomplished student of the mica group and he was the first to describe the polytypes of micas. Much of his career was with the U.S. Department of Agriculture, Beltsville, Maryland, USA. He was elected to the National Academy of Sciences and was a Medal of Science winner. In 1942, Henricks climbed Mount McKinley (now Denali), Alaska as part a the 3rd expedition to do so. In 1957, he was a member of a team who went mountain climbing in Western Canada. The team was roped together of a mountain when the rope failed and the entire party fell over 80 meters. Hendricks suffered a broken shoulder and a cracked vertebra, but he went for help. Through his efforts of abandoning his own food supply to his badly injured companions and a heroic two day trek back to civilization, he saved the entire expedition. In 1958 he was in the first group of five recipients to receive the President's Award for Distinguished Civilian Service from President Dwight D. Eisenhower. Additionally, Hendricks received several awards from a variety of professional societies in recognition to the scientific advances he made.|
Classification of Hendricksite
|Strunz 8th edition ID:||8/H.11-100|
|Nickel-Strunz 10th (pending) edition ID:||9.EC.20|
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.2.2b.6|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
|Hey's CIM Ref.:||16.12.19|
16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
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Type Occurrence of Hendricksite
|Co-type Localities:||Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA|
Buckwheat pit (Southwest opening; Buckwheat Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
|Year of Discovery:||1966|
Crystallography of Hendricksite
|Cell Parameters:||a = 5.37Å, b = 9.32Å, c = 10.3Å|
β = 99°
|Ratio:||a:b:c = 0.576 : 1 : 1.105|
|Unit Cell Volume:||V 509.15 Å³ (Calculated from Unit Cell)|
Optical Data of Hendricksite
|RI values:||nα = 1.598 - 1.624 nβ = 1.658 - 1.686 nγ = 1.660 - 1.697|
|2V:||Measured: 2° to 5°, Calculated: 20° to 44°|
|Maximum Birefringence:||δ = 0.062 - 0.073|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v slight|
Chemical Properties of Hendricksite
|Simplified for copy/paste:||K(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2|
|Essential elements:||Al, H, K, O, Si, Zn|
|All elements listed in formula:||Al, H, K, Mg, Mn, O, Si, Zn|
Relationship of Hendricksite to other Species
|Member of:||Mica Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Hendricksite
|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 Hendricksite
Frondel, Clifford and Ito, Jun (1966) Hendricksite, a new species of mica. American Mineralogist: 51: 1107-1123.
Evans, B.W. and Strens, R.G.J. (1966) Zinc mica from Franklin Furnace, New Jersey. Nature: 211: 619.
Robert, J.-L. and Gaspérin, M. (1985): Crystal structure refinement of hendricksite, a Zn- and Mn-rich trioctahedral potassium mica: a contribution to the crystal chemistry of zinc-bearing minerals. Tschermaks Mineralogische und Petrographische Mitteilungen: 34: 1-14.
Canadian Mineralogist: 36: 905-912.
Internet Links for Hendricksite
Localities for Hendricksite
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.