Beryllonite

Formula:  NaBePO4

Origin of name:  From composition

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell:

 

Colour:  Colourless, white, pale yellow

Diaphanetiy:  Transparent to translucent

Luster:  Vitreous, pearly perfect cleavages

Habit:  Crystals tabular to short prismatic and often highly modified

Hardness:  5.5 to 6

Specific gravity:  2.84

Cleavage: 3; {010} perfect, {100} good, {101} indistinct

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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