Zeophyllite

Formula: Ca₄Si₃O₈(OH,F)₄.2H₂O

Origin of name: from Greek for to boil and leaf in allusion to its habit.

Crystal system: Triclinic, pseudohexagonal

Crystal class: 3

Twinning:

Unit cell: a = 9.34, c = 36.48

Colour: White

Diaphaneity: Translucent to opaque

Luster: Pearly

Habit: Crystals platy; spherical masses with radiating foliated structure

Hardness: 3

Specific gravity: 2.75 to 2.76

Cleavage: 1; {001} perfect

Tenacity:

Streak: White

Synonyms/varieties:

Comments: