Formula: NaSr3Al3(F,OH)16
Origin of name: For Carl Jarl, Danish mining official
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white, gray
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals tabular, minute, elongates on c-axis; massive, radial columnar
Hardness: 4 to 4.5
Specific gravity: 3.87
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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