Nahcolite

Formula: NaHCO3

Origin of name: combination of symbols for elements

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: 

 

Colour: colourless, white, gray to brown or black from impurities

Diaphaneity: transparent to translucent

Luster: vitreous to resinous

Habit: crystals prismatic, elongated on c-axis, friable aggregates, fibrous veinlets, concretionary crystalline masses

Hardness: 2.5

Specific gravity: 2.21

Cleavage: 3; {101} perfect, {111} good, {100} distinct

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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