Formula :
Ca9H2[Si6O16(OH)10] * 6 H2O
System: triclinic Hardness:3½ Rarity:rare
Strunz id:VIII/D.18-10 -
SILICATES
Name origin: Named in 1966 by Alden B. Carpenter, Robert A. Chalmers, John Alan Gard, K. Speakman, and Harry Francis West Taylor in honor of U. S. A. Army Colonel Clarence Marvin Jenni [November 3, 1896 USA - November 1, 1973 Columbia, Missouri, USA], curator of the Geological Museum of the University of Missouri (1960-1967, but he remained somewhat active as a curator in retirement until his passing in 1973), Columbia, Missouri, USA, and who discovered the mineral.
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