Natroniobite

Formula: NaNbO3

Origin of name: from composition

 

Crystal system: monoclinic

Crystal class: unknown

Twinning: 

Unit cell: 

 

Colour: yellowish, brownish, blackish

Diaphaneity: 

Luster: 

Habit: irregular grains, fine-grained aggregates

Hardness: 5.5 to 6

Specific gravity: 4.40

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: dimorphous with lueshite

 

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