Formula: (Sr,Ba,Na)2Al(CO3)F5
Origin of name: for N. Steno (Steensen), Danish scientist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless to white
Diaphaneity:
Luster: vitreous
Habit: massive, grains to 4 cm
Hardness: about 3.5
Specific gravity: 3.86
Cleavage: 2; {001} and {120}
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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