General Information:
Chemical Formula:Ca9H2Si6O18(OH)8·6(H2O)
Composition:(Molecular Weight = 1,063.37 gm)Calcium 33.92 %
CaSilicon 15.85 %
SiHydrogen 2.09 %
H Oxygen 48.15 %
O Empirical Formula: Ca9H2Si6O18(OH)8·6(H2O)
Environment:Late stage mineral in metamorphosed limestone.
IMA Status:Approved IMA 1966
Locality:Crestmore Quarry, 5 miles NW of Riverside, Riverside Co. California.
Name Origin:Named for Clarence Marvin Jenni (1896-1973), American mineral collector and director of the Geological Museum, University of Missouri.
Physical Properties: Cleavage:[001] Distinct
Color:white.
Density:2.32 - 2.33, Average = 2.32
Habits:Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Platy - Sheet forms (e.g. micas).,
Hardness:3.5 - Copper Penny
Luminescence:Sometimes Fluorescent, Short UV=weak white.
Luster:Vitreous (Glassy)
Streak:white
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