Formula: NaNa2(Mg,Fe)3(Al,Fe)2(Si7Al)O22(OH)2
Origin of name: after locality Nybö, Nordfjord, Norway
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: bluish
Diaphaneity:
Luster: vitreous
Habit: rims on other minerals
Hardness: 5 to 6
Specific gravity: 3.04
Cleavage: 1; {110} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with ferronyböite, with ferric-nyböite and with ferric-ferronyböite
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