Formula: Ca9H2Si6O18(OH)8 . 6H2O
Origin of name: For Clanence Marvin Jenni, American museum director (1896-1973), Geological Museum, University of Missouri
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 10.56, b = 7.25, c = 10.81, α = 99.7°, β = 97.67°, γ = 110.07°
Colour: White
Diaphaneity:
Luster: Vitreous
Habit: Crystals bladed, small; fibrous aggregates
Hardness: 3.5
Specific gravity: 2.32
Cleavage: 1; {001}distinct
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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